i06895705
Glow Plug Starting Aid - Test
This procedure covers the following diagnostic code:
Use this procedure if there is a suspected fault in the
glow plug start aid circuit or the glow plugs.
Table 183
Diagnostic Trouble Codes For The Glow Plug Starting Aid
J1939 Code PDL Code
Code Description
(code descriptions may
vary)
Comments
676-5 2246-5
Engine Glow Plug Relay : Cur-
rent Below Normal
The Electronic Control Module (ECM) detects the following conditions:
The engine is not cranking.
The ECM has been powered for at least one second.
There is a low current condition (open circuit) in the glow plug start aid relay
circuit for more than 2 seconds.
The warning light will come on. The diagnostic code will be logged. An ECM
that was previously blank will require a total of 2 hours of operation before the
diagnostic code will be logged.
The ECM is unable to activate the relay for the glow plug starting aid. The glow
plugs will not operate. The engine may be difficult to start in cold temperatures
and the exhaust may emit white smoke.
676-6 2246-6
Engine Glow Plug Relay : Cur-
rent Above Normal
The Electronic Control Module (ECM) detects the following conditions:
The engine is not cranking.
The ECM has been powered for at least one second.
There is a high current condition (short circuit) in the glow plug start aid relay
circuit for more than 2 seconds.
The warning light will come on. The diagnostic code will be logged. An ECM
that was previously blank will require a total of 2 hours of operation before the
diagnostic code will be logged.
The ECM is unable to activate the relay for the glow plug starting aid. The glow
plugs will not operate or the glow plugs will operate all the time. The engine
may be difficult to start in cold temperatures and the exhaust may emit white
smoke.
Follow the troubleshooting procedure to identify the root cause of the fault.
The following background information is related
to this procedure:
The starting aid is used to improve the engine
starting when the engine is cold. With the keyswitch
in the ON position, the ECM monitors the following
parameters to decide if the glow plugs need to be
switched ON:
• Coolant temperature
• Intake manifold air temperature
If the glow plugs are required, then the ECM will
activate the starting aid relay for a controlled period.
While the glow plug start aid relay is activated, the
glow plug start aid relay will supply power to the glow
plugs. If a “Wait To Start” lamp is installed, then this
lamp will be illuminated to indicate the “Wait To Start”
period.
““Wait to Start Lamp””
This feature may be included as an option.
UENR4469-36 329
Circuit Tests
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