Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to "SELF-DIAGNOSTIC RESULT MODE ".

Is a malfunction in the CAN communication indicated in the results?
1. YES: Check CAN communication line. Refer to "DTC U1000 CAN COMMUNICATION LINE ".
2. NO: GO TO 2.

CHECK DTC WITH TCM

WITH CONSULT-II

Start engine.
Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.

While monitoring engine speed, check for engine speed change corresponding to wide-open throttle position signal.

ENGINE SPEED CONDITION - DISPLAY VALUE TABLE

Item name	Condition	Display value (RPM)
ENGINE SPEED	Engine running	Closely matches the tachometer reading.

Fig 1: Display DATA MONITOR Mode Screen

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 3.
NG: Check the ignition signal circuit.
- Refer to "IGNITION SIGNAL ".

CHECK DTC
Perform "DTC Confirmation Procedure".
- Refer to "DTC CONFIRMATION PROCEDURE ".
OK or NG
1. OK: INSPECTION END
2. NG: GO TO 4.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to "MAIN POWER SUPPLY AND GROUND CIRCUIT ".

OK or NG
1. OK: GO TO 5.
2. NG: Repair or replace damaged parts.
DETECT MALFUNCTIONING ITEM
Check the following items:
- The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
1. OK: Replace the control valve with TCM. Refer to "CONTROL VALVE WITH TCM AND A/T FLUID TEMPERATURE SENSOR 2 ".
2. NG: Repair or replace damaged parts.