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Home >> Mitsubishi >> 1983 >> Pickup Mighty Max >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Diesel >> Trouble Shooting >> Glow Plug System >> Engine Will Not Start, Engine Cold

Engine Will Not Start, Engine Cold

  1. Turn ignition on, and check for 10 or more volts at glow plugs for 1-6 seconds. If voltage exists go to step 5). If no voltage exists, check for 12 volts at battery side of glow plug relay 1. If voltage exists go to step 2). If no voltage exists, circuit is open in wiring harness.
  2. Check for 10 or more volts at terminal 1 of control unit with ignition switch on. If voltage exists go to step 3). If no voltage, switch or wiring harness is defective.
  3. Check continuity between glow plug side of glow plug relay 1 and plug. If continuity exists go to step 4). If no continuity, circuit is open in wiring harness.
  4. Check for 10 or more volts, applied to terminal 2 of the control unit, approximately 1-6 seconds after ignition is on. If voltage exists, glow plug relay 1 is defective. If no voltage, check water temperature sensor and wiring harness used for detection of glow plug temperature. If both sensor and harness are okay, control unit is defective.
  5. Approximately 1-6 seconds after switch is on, check for 5-8 volts at terminal 2 of control unit. Voltage lasts 6 seconds. If voltage exists, go to step 8). If no voltage, check for 12 volts at battery side of glow plug relay 2. If no voltage at relay, wiring harness is defective.
  6. Check continuity between dropping resistor side of glow relay 2 and glow plug. If continuity exists go to step 7). If no continuity, check resistor and attached harness.
  7. Check for 10 or more volts at terminal 4 of control unit, for 7-12 seconds after key is on. If voltage exists, glow plug relay 2 is defective. If no voltage, control unit is defective.
  8. Check for 9 or more volts at terminal 4 of control unit during engine cranking. If voltage exists, go to step 9). If no voltage, check for 9 or more volts at terminal 3 of control unit during engine cranking. If voltage exists, control unit is defective. If no voltage, check ignition switch and connecting wiring harness.
  9. Measure resistance of each glow plug one at a time. Specified value is less than .1 ohm at 68°F (20° C). If plugs are outside this value, replace them. If plugs are okay, check water temperature sensor for open or short circuit. If temperature sensor is okay go to step 10).
  10. Check resistance between control unit terminal 9 and glow plug ground. If resistance is excessive, harness mounting screw is loose. If resistance is okay, check fuel system for cause of no start condition.
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