AEM PN 30-0311 X-SERIES GAUGE OBD-II User Manual

: June 7, 2024
: AEM

AEM PN 30-0311 X-SERIES GAUGE OBD-II User Manual

STOP! – READ THIS BEFORE INSTALL OR USE!

WARNING:
THIS INSTALLATIONMAY REQUIREWELDING OR INTEGRATION INTO A VEHICLE’S ELECTRICAL SYSTEM. DAMAGE TO SENSITIVEELECTRONICS, FIRE, OR EXPLOSIONMAY OCCUR IF PROPER PRECAUTION IS NOT TAKEN. IF THERE IS ANY DOUBT, DO NOT ATTEMPT THEINSTALLATION AND CONSULT A PROFESSIONAL.
NOTE : IT IS THERESPONSIBILITY OF THEENGINETUNER TO ULTIMATELY CONFIRMTHECALIBRATION USEFOR ANY PARTICULAR ENGINEIS SAFEFOR ITS INTENDED USE. AEMHOLDS NO RESPONSIBILITY FOR ANY ENGINE DAMAGETHAT RESULTS FROMTHEMISUSEOF THIS PRODUCT

Features

2-1/16″ / 52mm outer diameter mounting
Only model year 2008 and newer vehicles (CAN bus based OBD) supported
41 OBD-II parameters (PIDs) supporte
Read and clear Diagnostic Trouble Codes (DTCs)
US or Metric / SI display modes
Black bezel / faceplate supplied; Silver/white available as optional purchase
Locking connectors
Auto-dimming
Supports vehicle/system voltages up to 16V

| KIT CONTENTS
---|---
PN| Description
10-0311| INST, X-SERIES OBD2 GAUGE
35-0311| GAUGE ASSY, X-SERIES OBD2 GAUGE
35-8618| NUT, KNURLED, M4x0.7 (2)
35-8614| BRACKET, X-SERIES GAUGE
35-8617| RUBBER BAND, X-SERIES GAUGE
35-3458| CABLE, X-SERIES GAUGE PWR/IO OBD2 V2
OPTIONAL ACCESSORIES

PN| Description
30-0311- ACC| BEZEL, X-SERIES SILVER FACEPLATE, X-SERIES OBD2, WHITE

Wiring Installation Diagram

Installation

The only wiring installation that is required is to plug the supplied OBD harness into your vehicle’s OBD2 port. The port is located beneath the driver’s side dash or in the driver’s side kick panel and may be located beneath a removable cover or door. Please refer to your vehicle’s service manual if you have trouble finding your port.

Notes on 12V Supply

The 12V power available at your vehicle’s OBD2 port is a permanent “always on” 12V — no key switched power is available at this port. The AEM X-Series OBD2 Gauge uses a specific algorithm to detect when the key is on and the engine is started to wake up or go to sleep down, conserving power. The engine must be running for the gauge to remain on and display information.
NOTE: It is advised to unplug the gauge from the OBD port if the vehicle is to be stored for long periods of time to avoid excess drain on the battery. The gauge can consume up to 20mA while in sleep mode.

Pin	Color	Description
1	WHITE	OBD2 / CANH
2	GREEN	OBD2 / CANL
3	RED	Switched 12V Power
4	BLACK	Power Ground
5 – 10	NC	NC

Operation

View Parameter IDs (PIDs)

Depress the PAGE button to scroll through the available OBD-II PIDs/parameters; an abbreviation of each parameter name will be briefly displayed after each button press.
The inner numeric LEDs and outer ring LED display the currently selected parameter reading. Please reference the supported OBD-II PID description table further on in this document. The gauge is capable of displaying all the PIDs listed in this table, however, the PID must be available on your specific vehicle. Not all PIDs are available on all vehicles. PAGE and DTC buttons are located on the face of the gauge and are used to perform
various functions, described below.

Display or clear stored DTC (Diagnostic Trouble Codes

After pressing the DTC button, “dTC” will be briefly be displayed.
If no DTCs are available, “nonE” will be displayed.
If DTCs are available, the gauge will begin displaying the codes by briefly displaying the alphabetic prefix and then the numeric suffix.
DTC codes have a standardized format; one letter followed by four numbers, e.g. P0030. You may look up their meaning by referring to your vehicle’s factory service manual or using an online resource such as www.obd-codes.com.
For example, a P0030 code will be displayed as first “P” and then “0030”.
Briefly pressing the DTC button will scroll through the stored codes if there are more than one.
Depress and hold the DTC button, while viewing the DTCs, to clear them.
Some vehicles require the engine be off to clear codes. In this case, start the engine to wake up the gauge, turn off the engine but return the key to the “run” position so the ECU is on. Immediately after, follow the procedure to clear the DTCs before the gauge goes to sleep.
Alternatively, if you don’t wish to start the engine, you may unplug the gauge from the OBD port and plug it back in to wake up the gauge, turn the key to Run, and then follow the procedure to clear DTCs.
The gauge will return to normal display mode a few seconds after the last button press Change display

DTC Trouble Code Search

Search

OBD-II search powered by dot.report

Change display units US / SI (metric)

The gauge should be in its normal display mode, showing the current parameter reading
Depress and hold both the PAGE button for three seconds until US or SI appears
Press the PAGE button to toggle between US or SI (metric) modes
The gauge will return to normal display mode a few seconds after the last button press

Faceplate / Bezel Installation

The gauge kit is supplied assembled with a black faceplate and black bezel. An accessory kit is available (for purchase through AEM dealers) which includes an optional silver bezel and white faceplate. Please reference the Optional Accessories section earlier in the document for the appropriate part numbers. Contact your dealer or visit www.aemelectronics.com for more information.
The faceplate may be reversible, displaying alternative scalings on either side. Reference the Operation section of this manual for details on how to switch the display mode when reversing the faceplate. Disassembly is required to change the faceplate, flip/reverse the faceplate, or change the bezel of the gauge. The following diagram will provide familiarization with the major components of the gauge prior to beginning the procedure.

Item	Qty	Description
1	1	Lens
2	1	Bezel
3	1	Faceplate
4	1	Diffuser
5	1	Light Guide
6	2	Button
7	2	Mounting Stud (M4 x 0.7)
8	3	Assembly Screw
9	1	Mounting Bracket
10	2	Brass Thumb Screw (M4 x 0.7)
11	1	Printed Circuit Board (PCB)

Gauge Disassembly

STEP 1 –

Remove the three assembly screws (8) using a #1 Phillips head screwdriver. Separate the bezel (2) and cup (7) from the rest of the assembly. If you have purchased the optional accessory kit, the silver
bezel may be replaced for the existing bezel at this time

STEP 2 –

Separate the PCB (11) from the remaining components

STEP 3 –

Slide the light guide (5) upward to remove it, the buttons may fall out at this time – take care not to lose them

STEP 4 –

As you separate the remaining components, diffuser (4), faceplate (3), lens (1), note the order in which they were assembled.
The faceplate (3) may now be reversed to display an alternate scaling or replaced for a different color as included in the optional accessory kit

Gauge Assembly

STEP 1 –

Place the light guide (5) on a flat surface (black side up) and slide the buttons (6) into the slots

STEP 2 –

Stack the diffuser (4), faceplate (3), and lens (1) in order, over the buttons, and on to the light guide

STEP 3 –

Reassemble the PCB and display stack with the bezel, making sure screw holes are aligned through the entire assembly

STEP 4 –

Reassemble and tighten screws to 2 in-lb (previously assembled bezel) or 3 in- lb (new bezel). Do not over-tighten!

Gauge Installation

A 2-1/6″ (52mm) hole is required to mount the X-Series gauge. A bracket and thumbscrews are provided to facilitate installation into a panel or gauge pod. In some cases, the gauge cup may be pushed into a mounting hole causing an interference fit strong enough to retain the gauge; the supplied rubber band may be fit to the gauge to create a tighter fit in mounting holes slightly larger than 52mm. It is, however, recommended that gauges be mounted securely using the supplied bracket to ensure they never become loose and cause a hazard during vehicle operation.

Note: The gauge is not water-proof and should not be installed in a location with exposure to water or snow. Damage caused by water ingress will not be covered under warranty.

OBD-II Parameter IDs (PIDs)

PID

(hex)

| Display Label| Description| US| SI| Notes
---|---|---|---|---|---
10| . ffi L o| MAF air flow rate| lb/min| g/sec|
0F| ir.t| Intake air temp| degF| degC|
46| ir.t| Ambient air temp| degF| degC|
68| ir.t| Intake air temp sensor| degF| degC| If $0F is n/a
33| ro| Barometric pressure (abs)| psi| kPa|
42| tt| Control Module Voltage| V| V|
05| Cl.t| Engine coolant temp| degF| degC|
23| . r| Fuel Rail Pr (die or gdi)| kpsi| bar| If $0A & $22 are n/a
59| . r| Fuel Rail Pr (die or gdi)| kpsi| bar|
6D| . r| Fuel Rail Pr (die or gdi)| kpsi| bar|
78| t.| EGT Bank 1| degF| degC| B1S1 only
79| t.| EGT Bank 2| degF| degC| B2S1 only
0C| .| Engine RPM| rpm| rpm|
52| th| Ethanol fuel %| %| %|
66| ffi l o| Mass air flow sensor| lb/min| g/sec| FLOA + FLOB (if supp)
2F| ffi . L L| Fuel Level Input| %| %|
0A| ffi . r| Fuel pressure (gauge)| psi| bar|
22| ffi . r| Fuel Rail Pr (rel to map)| psi| bar| If $0A & $23 are n/a
5E| ffi . r t| Engine fuel rate| ga/hr| liter/hr|
5B| . t| Hybrid Battery Charge| %| %|
03| Loo| Fuel system status| n/a| n/a| “OL” = Open Loop / “CL” = Closed Loop
0E| n| Timing advance| degBTDC| degBTDC| -Negative sign indicates retard e.g. “-10” = 10 degATDC
0B| nt.| Intake Manifold press (abs)| psi| kPa|
70| nt.| Boost pressure control| psi| kPa| Gauge pressure
87| nt.| Intake man abs press| psi| kPa| If $0B is n/a
24| L .| O2S1_WR_lambda(1)| AFR| Lambda|

30-0311 – OBD-II

| 8
---|---
34| L .| O2S1_WR_lambda(1)| AFR| Lambda| If $24 is n/a
28| L .| O2S5_WR_lambda(1)| AFR| Lambda|
38| L .| O2S5_WR_lambda(1)| AFR| Lambda| If $28 is n/a
07| L . ffi t .| LT fuel % trim—Bank 1| %| %| -Negative = Lean / +Positive = Rich
09| L . ffi t .| LT fuel % trim—Bank 2| %| %| -Negative = Lean / +Positive = Rich
04| Lo| Calculated engine load| %| %|
5C| o L.t| Engine oil temp| degF| degC|
06| . ffi t .| ST fuel % trim—Bank 1| %| %| -Negative = Lean / +Positive = Rich
14| . ffi t .| Bank 1, Sensor 1: STFT| %| %| -Negative = Lean / +Positive = Rich, If $06 is n/ a
08| . ffi t .| ST fuel % trim—Bank 2| %| %| -Negative = Lean / +Positive = Rich
18| . ffi t .| Bank 2, Sensor 1: STFT| %| %| -Negative = Lean / +Positive = Rich, If $08 is n/ a
62| tor| Actual Engine – Percent

Torque

| %| %|
11| t| Throttle position| %| %| % = ( TPS Voltage / 5.0V ) * 100
45| t| Relative throttle position| %| %| % = ( (TPS Voltage – Closed TPS Voltage) / 5.0V

) * 100

44| tr.L| Command eq ratio| AFR| Lambda|
0D| | Vehicle speed| mph| kph|

FAQ / Troubleshooting

I installed my gauge correctly and the display just shows dashes, “—-“, or keeps going dark, turning the display off

Make sure the OBD-II connector is firmly seated into the car’s OBD-II port
Make sure that your car is fitted with an OEM ECU that supports OBD-II over CAN. This is federally mandated for US vehicles 2008 and newer, however some older cars may have adopted CAN in earlier model years.
Most vehicles require the key to be in the ‘Run’ position such that the OEM ECU is powered on and sending OBD-II data to the gauge.
The engine must be started and remain running for the gauge to remain “awake.”
Make sure that the AEM OBD-II gauge is the only OBD-II device/scanner that is connected to the vehicle. Multiple devices on the bus may cause unexpected functionality

This manual says that a PID is supported but I can’t find it when I scroll through the PID list using the PAGE button.
Your vehicle may not support every PID that is supported by the AEM OBD-II gauge. Upon power-up, the gauge will query
the vehicle for a list of the available PIDs and display the ones which are supported by the gauge. If the PID is not listed when scrolling through the list using the PAGE button, then the PID is not supported by your vehicle.
My gauge is displaying DTC (Diagnostic Trouble Codes) but I don’t know what they mean.
DTC codes have a standardized format; one letter followed by four numbers, e.g. P0030. You may look up their meaning by referring to your vehicle’s factory service manual or using an online resource such as www.obd-codes.com.
My check engine light is on or my other OBD-II scanner says I have a DTC but the gauge reports “nonE” when I depress the DTC button.
The OBD-II specification sets forth a distinction between “pending” trouble codes and “stored” trouble codes. The AEM
OBD-II gauge will only display “stored” trouble codes. Please refer to your factory service manual or SAE specification for further information on “pending” codes. The gauge’s DTC clear function will, however, reset ALL codes, both pending and stored.
I followed the procedure to clear my DTC, the gauge said “CLr” but the light remains on and I still have codes. Some vehicles require the engine be off to clear codes. In this case, start the engine to wake up the gauge, turn off the engine but return the key to the “run” position immediately so the ECU is on and transmitting CAN data to the gauge. Immediately after, follow the procedure to clear the DTCs before the gauge goes to sleep. Alternatively, if you don’t wish to start the engine, you may unplug the gauge from the OBD port and plug it back in to wake up the gauge, turn the key to Run, and then follow the procedure to clear DTCs.
My gauge seems to take a long time to turn on/off

The 12V power available at your vehicle’s OBD2 port is a permanent “always on” 12V, no key switched power is available at this port. The AEM X-Series OBD2 Gauge uses a specific algorithm to detect when the key is on and the engine is started to boot up or shut down, conserving power. The engine must be running for the gauge to remain on and booted up.
NOTE: It is advised to unplug the gauge from the OBD port if the vehicle is to be stored for long periods of time to avoid excess drain on the battery.

What pins are used in the connector?

To populate optional extras, use JST P/N SPUD-001T-P0.5 terminals for 22-26 AWG wire. For support, contact AEM Technical Support at 1-800-423-0046 or gentech@aemelectronics.com.

Specification

Dimensions	diameter (bezel)	2.40	in
diameter (cup)	2-1/16	in
depth (incl. bezel)	0.825	in
depth (cup only)	0.200	in
Supply Voltage	min	10	VDC
max	18	VDC
Supply Current (13.8V)	nominal	50.0	mA
Operating Temperature	min	-4 / -20	degF / degC
max (16V Supply)	185 / 85	degF / degC

12 Month Limited Warranty

Advanced Engine Management Inc. w arrants to the consumer that all AEM High Performance products w ill be free from defects in material and w orkmanship for a period of tw elve (12) months fromdate of the original purchase. Products that fail w ithin this 12-month w arranty period w ill be repaired or replaced at AEM’s option, w hen determined by AEMthat the product failed due to defects in material or w orkmanship. This w arranty is limited to the repair or replacement of the AEM part. In no event shall this w arranty exceed the original purchase price of the AEM part nor shall AEMbe responsible for special, incidental or consequential damages or cost incurred due to the failure of this product. Warranty claims to AEM must be transportation prepaid and accompanied w ith dated proof of purchase. This w arranty applies only to the original purchaser of product and is non-transferable. All implied w arranties shall be limited in duration to the said 12-month w arranty period. Improper use or installation, accident, abuse, unauthorized repairs or alterations voids this w arranty. AEM disclaims any liability for consequential damages due to breach of any w ritten or implied w arranty on all products manufactured by AEM. Warranty returns w ill only be accepted by AEM w hen accompanied by a valid Return Merchandise Authorization (RMA) number. Product must be received by AEMw ithin 30 days of the date the RMA is issued. UEGO oxygen sensors are considered w ear items and are not covered under w arranty. Please note that before AEM can issue an RMA for any electronic product, it is first necessary for the installer or end user to contact the EMS tech line at 1-800-423-0046 to discuss the problem. Most issues can be resolved over the phone. Under no circumstances should a system be returned or a RMA requested before the above process transpires. AEM w ill not be responsible for electronic products that are installed incorrectly, installed in a non-approved application, misused, or tampered w ith.
Any AEMelectronics product can be returned for repair if it is out of the w arranty period. There is a minimumcharge of $50.00 for inspection and diagnosis of AEMelectronic parts. Parts used in the repair of AEM electronic components w ill be extra. AEM w ill provide an estimate of repairs and receive w ritten or electronic authorization before repairs are made to the product.