G 85 Engine Starting Troubleshooting
wc_tx000678gb.fm 67
7.6 Checking the Intake Heater Relay
Prerequisites Battery voltage measuring 11–13VDC
Procedure Follow the procedure below to check the intake heater relay.
1. Locate the intake heater relay.
2. Check the voltage between terminal 30 (red wire #11) of the intake heater relay and
ground.
Is at least 9.8VDC measured?
3. Place the START/RUN switch in the ON position.
4. Check the voltage between terminal 86 (grey wire #65) and ground during cranking.
Is at least 9.8VDC measured?
5. Check the connection to ground of black wire #14 at terminal 85.
Is there a path to ground?
6. Place the START/RUN switch in the ON position.
7. Check the voltage between terminal 87 (red wire #12) and ground
Is at least 9.8VDC measured?
The intake heater relay has now been checked.
Yes____ No____ Your reading
Continue Repair or replace red wire #11.
Yes____ No____ Your reading
Continue Repair or replace grey wire #65.
Yes____ No____ Your reading
Continue Repair or replace wire #14.
Yes____ No____ Your reading
The intake heater relay is
OK.
The intake heater relay has
failed; replace it.
wc_gr003912
Starter
relay
Intake heater
relay
R 50
R 422
B 050D
R
85
86
30
87
R 11
R 12
B 14
Gr 65
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