Note. Before performing any diagnostic test, refer toWARNINGS, CAUTIONS and NOTES in DIAGNOSTIC TESTS .
Note. Testing individual components does not isolate shorts or opens. Perform all voltage tests using a Digital Volt-Ohmmeter Meter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.
Diagnostic Aids
No Drive signal detected. Check for following possible problems
- Open or short between ground and ECM Manual Transmission/Automatic Transmission.
- Poor connection to ground at ECM.
- Normal Condition: A/T-Chassis Ground, M/T-Open