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Cold Engine

  1. Disconnect vacuum hose No. 16 from EGR valve and connect vacuum gauge to hose. Start engine and raise engine speed to 4500-5000 RPM. Vacuum should not be available to EGR valve.
  2. If vacuum is not available to EGR valve, proceed to HOT ENGINE test. If vacuum is available, check for voltage at EGR control solenoid valve A in emission box No. 1 (Blue wire on 1300 and 1500 except HF, and Yellow/White wire on 1500 HF models).
  3. There should be voltage at solenoid. If there is voltage, replace EGR solenoid valve A and retest. If there is no voltage, check the following: On all 1500 HF models except High Alt., check control switch and thermosensor B.
  4. Check for voltage at control unit connector (Black/Yellow wire) with ignition on. There should be voltage. If no voltage, check fuse and wiring. Check Black wire for continuity between control unit and ground. There should be continuity. On all other models, check thermosensor B, wiring and fuse. Retest after repairs.
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