Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1992 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definition
NOTE:
When using trouble code charts, refer to Fig 1
for symbol identification.
DIAGNOSTIC TROUBLE CODE IDENTIFICATION CHART
| Code | System Affected | Probable Cause | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 11 (1) | Crank Angle Sensor | (2) No Crank Signal | ||||||||
| 12 | Airflow Meter Circuit | Open/Shorted Circuit | ||||||||
| 13 | Coolant Temperature Sensor | Open/Shorted Circuit | ||||||||
| 14 | Vehicle Speed Sensor (VSS) | No VSS Signal | ||||||||
| 16 | Traction Control System | (3) No TCS Signal | ||||||||
| 21 (1) | Ignition Signal Circuit | (2) Open/Shorted Circuit | ||||||||
| 31 | ECU | Signals Not Normal | ||||||||
| 32 (4) | EGR Function | No EGR Action | ||||||||
| 33 | O2 Sensor (Left) | Open Circuit/High O2 Signal | ||||||||
| 34 (1) | Knock Sensor | Open/Shorted Circuit | ||||||||
| 35 (4) | Exhaust Temperature Sensor | Open/Shorted Circuit | ||||||||
| 43 | Throttle Sensor | Open/Shorted Circuit | ||||||||
| 45 (4) | Injector Leak | Leak At Injectors | ||||||||
| 46 (4) (W/TCS) | Secondary Throttle Position Sensor | Open/Shorted Circuit | ||||||||
| 51 (4) | Injector Circuit | Injector Does Not Work | ||||||||
| 53 | O2 Sensor (Right) | Open Circuit/High O2 Signal | ||||||||
| 54 (1) | Automatic Transmission Signal | Open Signal Transmission Control Unit | ||||||||
| 55 (1) | No Malfunction (Q45) | Normal Condition | ||||||||
|
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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