Note: Follow this procedure to diagnose the conditions of excessive white smoke and/or poor idle quality after starting.
1. Begin the test with the engine at 80° F (27° C).
2. Rotate the ignition switch to the RUN position and allow the glow plug system to cycle for 2 minutes.
3. Crank the engine for 1 second and return the ignition switch to the RUN position.
4. Observe that the glow plug system continues to cycle at least once after cranking.
5. If the glow plug system does not cycle after cranking, remove the controller circuit electrical connector, move the ignition switch to RUN and measure the voltage at terminal B (harness side) (refer to Figure 8-24, view A):
• If voltage measured is zero, go to step 6.
• If voltage measured is battery voltage, repair the circuit from the cranking motor solenoid to terminal B and check system operation.
6. With the controller circuit electrical connector removed, move the ignition switch to crank for 1 second while measuring the voltage at terminal B (harness side) (refer to Figure 8-24, view B):
• If voltage measured is battery voltage, replace the controller/relay and check system operation.
• If voltage measured is zero, repair the circuit between the circuit from the cranking motor solenoid to
terminal B and check system operation.
Note: Install the controller circuit electrical connector after step 6.
Refer to the following reference chart, if necessary: