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Home >> Infiniti >> 2003 >> QX4 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 47 (Automatic Transmission Diagnosis - U140E & U140F) >> Diagnostic Tests >> DTC P0758: Shift Solenoid Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

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  1. Access ECM located behind glove compartment. Disconnect appropriate ECM connector. Using a DVOM, measure resistance between terminal SL2+ and SL2- at ECM connector. See PIN VOLTAGE TESTS .
  2. Resistance should be 5.1-5.5 ohms. If resistance is as specified, replace ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. If resistance is not as specified, disconnect 10-pin solenoid connector located above PNP switch on side of transaxle. See Figure. Check circuit continuity between ECM connector terminal SL2+ and solenoid connector terminal No. 4, and between ECM connector terminal SL2- and solenoid connector terminal No. 9.
  3. If continuity exists, check shift solenoid SL1 for malfunction. See appropriate solenoid test under COMPONENT TESTS . If continuity does not exist, check and repair wiring harness or connector between solenoid connector and ECM.
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