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• When Monitored: • Set Condition: Possible Causes ECM - S/C SIGNAL CIRCUIT OPEN ECM - S/C SIGNAL CIRCUIT SHORTED TO VOLTAGE ECM - SENSOR GROUND OPEN S/C SWITCH SIGNAL CIRCUIT OPEN S/C SWITCH SIGNAL CIRCUIT OPEN S/C SWITCH SIGNAL CIRCUIT SHORT TO GROUND S/C SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE S/C SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE SENSOR GROUND OPEN SPEED CONTROL SWITCHES Diagnostic Test 1. VERIFY S/C SWITCH SIGNAL CIRCUIT VOLTAGE NOTE: If the ECM detects and stores a DTC, the ECM also stores NOTE: Before erasing stored DTCs, record these conditions. Disconnect the harness connectors from both S/C Switches. Turn the ignition on. Measure the voltage of the S/C Switch #2 Signal circuit at both S/C Select the appropriate voltage reading. 4.5 to 5.5 volts at both connectors. Go To 2 4.5 to 5.5 volts at only one connector. Repair the S/C Switch Signal circuit that measured below Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). Below 4.5 volts at both connectors. Go To 4 Above 5.5 volts for either measurement. Go To 6 9 - 1074 ENGINE DIESEL DIAG KJ |