Throttle Valve Opening Signal Circuit Check: Esteem

1. Ensure no DTCs exist. See appropriate SELF DIAGNOSTICS article in ENGINE PERFORMANCE. If any DTCs exist, repair as necessary. If no DTCs exist, go to next step.
2. Turn ignition switch to ON position. Using DVOM, backprobe for voltage between ground and PCM harness connector E92 terminal No. 1 (Orange wire). See Fig 1 . Monitor signal voltage reading while opening throttle from closed (idle) position to full open position. If reading does not vary as indicated in graph, go to next step. See Fig 2 . If reading changes as indicated in graph, throttle valve opening signal circuit is okay.
3. Turn ignition switch to OFF position. Disconnect PCM harness connector. Using jumper wire, connect Gray wire from main relay to ground. Main relay is located in underhood relay box, next to battery. Turn ignition switch to ON position. Measure voltage between ground and PCM harness connector E92, terminal No. 1 (Orange wire). If reading indicates 10-14 volts, go to next step. If reading does not indicate 10-14 volts, go to step  5 .
4. Check Throttle Position (TP) sensor and circuits. See SYSTEM & COMPONENT TESTING article in ENGINE PERFORMANCE. If TP sensor and circuit is okay, replace PCM and retest.
5. Check Orange wire between PCM and CC ECU for an open or shorted condition. See WIRING DIAGRAMS  . Repair Orange wire as necessary. If Orange wire circuit is okay, perform CC ECU power and ground circuit checks. See CRUISE CONTROL MODULE POWER & GROUND CIRCUIT CHECKS  .

Fig 1: Identifying PCM Connector E92 Terminals (Esteem)

Courtesy of SUZUKI OF AMERICA CORP.

Fig 2: Checking Throttle Valve Opening Signal Voltage (Esteem)

Courtesy of SUZUKI OF AMERICA CORP.