STEP/SEQUENCE RESULT WHAT TO DO NEXT TM 9-2320-363-20-1 Section 4 TROUBLESHOOTING CHARTS C.  CEL - FIRST CHART FOR DIAGNOSIS OF DDEC. III WHEN NO DDR IS AVAILABLE (Cont'd) CEL-4 Verify Code(s) Turn ignition on. "Check Engine" Read codes and follow Obtain a DDR. light stays on. appropriate diagnostic Chart. Clear codes Turn ignition off then back on. "Check Engine". Note status of "Check Engine" light goes on for 5 Go to CEL-5. light. seconds, then goes out. "Check Engine" light . Go to CEL-8. is erratic or intermittent. CEL-5 Verify Code(s) with the Engine Running Attempt to start and run the Engine will Go to Chart 2, pg 3-345.63. engine. not start. Try to get the "Check Engine" light on by: - warming up the engine "Check Engine" Previous codes should be - slowly changing the engine light is off. regarded as intermittent. from idle to no load speed. Go to Chart 1, pg 3-345.57. Run engine until the "Check Engine" light comes on or for "Check Engine" Read codes. 1 minute. light is on. Follow appropriate diagnostic Code Chart. CEL-6 Check for Open Turn ignition off. Less than or Go to CEL-7. Disconnect the vehicle harness equal to 5 ohms on. connector at the ECM. Install a jumper wire between sockets C1 and G1 of the vehicle Greater than An open exists either in the harness connector. 5 ohms or open on Diagnostic Request line (ckt Also read resistance between pin either reading. #528 or in the DDR ground line E of DDR connector and a (ckt #901).  Repair open.  Then good ground. go to CEL-30. Change 3  3-345.53