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Engine Management – V6 – Diagnostics Page 6C1-2–166
Test Description The following numbers refer to the step numbers in the diagnostic table: 4 This step tests the ECM ground circuits and supply voltage. DTC P1648 Diagnostic Table Step Action Yes No 1 Has the Diagnostic System Check been performed? Go to Step 2 Refer to 4.4 Diagnostic this Section 2 1 Switch off the ignition for 30 seconds. 2 Using Tech 2, select the DTC display function. N O T E Do not attempt to perform any Tech 2 function that Does DTC P1648 fail this ignition cycle? Go to Step 4 Go to Step 3 3 Using Tech 2, attempt a programming function that requires the ECM Has the programming function been successfully performed? System OK Go to Step 4 4 1 Test all ECM ground circuits for a high resistance or an open 2 Test the ECM ignition supply voltage circuit for a high Has any fault been found and rectified? Go to Step 6 Go to Step 5 5 Replace the ECM. Refer to 6C1-3 Engine Management –V6 – Service Has the repair been completed? Go to Step 6 — 6 1 Using Tech 2, clear the DTCs. 2 Switch off the ignition for 30 seconds. Does DTC P1648 fail this ignition cycle? Go to Step 2 Go to Step 7 7 Using Tech 2, select the DTC display function. Does Tech 2 display any DTCs? Go to the appropriate DTC Table in this Section System OK When all diagnosis and repairs are completed, clear all DTCs and check the system for correct operation. 7.44 DTC P1668, P2500 or P2501 DTC Descriptors This diagnostic procedure supports the following DTCs: • DTC P1668 – Generator L Terminal Circuit Malfunction • DTC P2500 – Generator L Terminal Low Voltage • DTC P2501 – Generator L Terminal High Voltage |