Chrysler Caravan/Voyager/Town n Country 1984-1995

DIS System Diagnosis and Testing

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FAILURE TO START TEST



See Figures 1, 2 and 3



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Fig. Fig. 1: Wiring harness coil connector-3.3L and 3.8L engines



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Fig. Fig. 2: Ignition coil terminal identification-3.3L and 3.8L engines



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Fig. Fig. 3: Ignition coil electrical connection-3.3L and 3.8L engines

1990-91 Models

Apply the parking brake and block the wheels before performing any engine running tests, including idle or timing checks and adjustments.

  1. Check battery voltage and determine that a minimum of 12.4 volts is available for operation of cranking and ignition systems.
  2.  
  3. Connect a voltmeter to the wiring harness coil connector at the B+ (battery positive voltage) pin.
  4.  
  5. Crank the engine for 5 seconds while monitoring voltage at the B+ terminal. If voltage remains near 0 during entire period of cranking, please refer to Fuel System in this guide for on-board diagnostic checks of SBEC and auto shutdown relay.
  6.  
  7. If measured voltage is near battery voltage but drops to 0 after 1-2 seconds of cranking, please refer to Fuel System in this guide for on-board diagnostic checks of distributor reference pick-up circuit to SBEC.
  8.  
  9. If measured voltage remains near battery voltage for entire 5 second cranking period, turn the key OFF and remove SBEC 60-way connector. Check the 60-way connector for any spread terminals.
  10.  

1992-95 Models

Apply the parking brake and block the wheels before performing any engine running tests, including idle or timing checks and adjustments.

  1. Check battery voltage and determine that a minimum of 12.66 volts is available for operation of cranking and ignition systems.
  2.  
  3. Disconnect the harness connector from the coil pack.
  4.  
  5. Connect a test light to the coil connector at the B+ pin (battery positive voltage) and ground. The wire for the B+ terminal is dark green with a black tracer.
  6.  
  7. Turn the ignition key to the ON position. The test light should flash on and then off. Do not turn the key to the OFF position, leave it in the ON position. If the test light flashes momentarily, the PCM grounded the auto shutdown (ASD) relay. If the test light did not flash, the ASD relay did no energize. The cause is either the relay or the relay circuits.
  8.  
  9. Crank engine and if the test light momentarily flashes during cranking, the PCM is not receiving a crankshaft position sensor signal and the sensor and sensor circuits will have to be tested with the appropriate scan tool.
  10.  
  11. If the test light did not flash during cranking, unplug the crankshaft position sensor connector. Turn the ignition key to the OFF position. Turn the key to the ON position, and wait for the test light to momentarily flash once, then crank the engine. If the test light momentarily flashes, the crankshaft position sensor is shorted and must be replaced. If the light did not flash, the cause of the no-start is either the crankshaft position sensor/camshaft position sensor 8-volt supply circuit, or the camshaft position sensor output or ground circuits. The use of an appropriate scan tool will be needed to test these circuits.
  12.  

SPARK AT COIL TEST



3.3L and 3.8L Engines

See Figure 4



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Fig. Fig. 4: Testing for spark at the coil-3.3L and 3.8L engines

Since their are 3 independent coils in the package, each coil must be checked individually. Remove the cable from the No. 2 spark plug. Insert a metal object into the spark plug boot and hold the end of the cable about 1 / 4 in. (6mm) from a good engine ground. Crank the engine and look for a spark at the cable. Repeat the above test for cylinders No. 4 and No. 6. If there is no spark during all 3 cylinder tests, proceed to the Failure To Start Test.

 
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