Throttle Valve Opening Signal Circuit Check
NOTE:
PCM may also be referred to as ECM
- Ensure no DTCs exist. See SELF DIAGNOSTICS - INTRODUCTION article in ENGINE PERFORMANCE. If any DTCs exist, repair as necessary. If no DTCs exist, go to next step.
- Turn ignition on. Using voltmeter, backprobe between ground and PCM harness connector terminal No. 6 (Orange wire on Esteem; Gray wire on Grand Vitara and Vitara) while opening and closing the throttle. See Fig 1 or Fig 2 . If voltage does not vary with opening and closing of throttle, go to next step. If voltage does vary with opening and closing of throttle, circuit is okay.
- Ensure ignition is off. Disconnect PCM harness connector. Using jumper wire, connect Gray wire terminal (Esteem) or Blue wire terminal (Grand Vitara and Vitara) at main relay to ground. Turn ignition on. Check voltage between ground and PCM harness connector terminal No. 6 (Orange wire on Esteem; Gray wire on Grand Vitara and Vitara). If 10-14 volts exists, go to next step. If 10-14 volts does not exist, go to step 5 .
- Check Throttle Position Sensor (TPS) and circuits. See SYSTEM & COMPONENT TESTING article in ENGINE PERFORMANCE. If TPS and circuits are okay, substitute known good Powertrain Control Module (PCM) and retest.
- Check Orange wire (Esteem) or Gray wire (Grand Vitara and Vitara) between PCM and Cruise Control Electronic Control Unit (CC ECU) for open or short. See WIRING DIAGRAMS . Repair wiring as necessary. If wiring is okay, check CC ECU power and ground circuits. See CRUISE CONTROL MODULE POWER & GROUND CIRCUITS .