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HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–133 Chart A: Heating Start Timing Control Failure CAUTION: There are conditions which air 1. The throttle is griater than 90%. 2. The ignition voltage is below 10.5 volts. 3. The engine speed greater than 4500 RPM for 5 seconds or 5400 RPM. 4. The engine coolant temperature (ECT) is greater than 125 °°°° C (257 °°°° F). 5. The intake air temperature (IAT) is less than 5 °°°° C (41 °°°° F). 6. The power steering pressure switch signals a high pressure condition. Condition Possible cause Correction Heating start timing control failure — Refer to Chart A Step Action Value(s) Yes No 1 Is the fuse No.F–5 normal? — Go to Step 2 Replace the fuse 2 Is the relay No.X–1 normal? — Go to Step 3 Replace the relay 3 Is the thermo unit No.E–23 normal? — Go to Step 4 Replace the thermo unit 4 Is the resistor No.C–73 normal? — Go to Step 5 Replace the resistor 5 Is there continuity between the harness side — Go to Step 7 Go to Step 6 6 Repair an open circuit between terminal No.C73–1 — Go to Step 5 — 7 Is there continuity between the harness side — Go to Step 9 Go to Step 8 8 Repair an open circuit between terminal No.C73–3 — Go to Step 7 — 9 Turn on the ignition switch (the engine is run). — Go to Step 11 Go to Step 10 10 Repair an open circuit between terminal No.C73–2 — Go to Step 9 — 11 Replace the auto air conditioner control unit. — Verify repair — |