GLOW PLUG SYSTEM
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 4C-9
Glow Plug Actuator Relay and Auxiliary Relay
For more information on circuit description and testing refer to SECTION 5E - Diagnostic
Circuit Checks.
Testing
1. Ensure battery is fully charged.
2. Check the following before testing relays:
a. All wires in circuit are connected.
b. Plug-in connectors are fully engaged.
c. All connections are corrosion free.
d. Engine Coolant Temperature switch appears to be present and in usable condition.
e. Circuit breakers on electrical box are not open (tripped).
f. Fuse at instrument panel is not defective (blown).
3. The following information applies to operations/tests of the main Glow Plug Actuator
Relay:
NOTE: The relay numbers can be found on the bottom of the relay.
• Terminal 30 is connected to battery voltage through a circuit breaker.
• Terminal 86 is connected to terminal 30.
• Terminal 87 is connected (a circuit is formed) to terminal 30 in the energized (ON)
position. Terminal 87 then supplies battery voltage to one half of the engines glow
plugs and to the glow Plug Auxiliary Relay.
• Terminal 85 is grounded by the ECM, causing the relay to be energized.
4. The following information applies to operations/tests of the Glow Plug Auxiliary Relay:
• Terminal 30 is connected to battery voltage through a circuit breaker.
• Terminal 86 is connected to terminal 30.
• Terminal 87 is connected (a circuit is formed) to terminal 30 in the energized (ON)
position. Terminal 87 then supplies battery voltage to one half of the engines glow
plugs.
• Terminal 85 is grounded causing the relay to be energized.
To Next Page
Loading...
Need help?
General