RD 12/RD 12A Honda Engine Starting System
wc_tx000693gb.fm 39
3.6 Checking the Neutral Relay
Prerequisites
Multimeter
Fully-charged (approximately 12V) battery
Functioning 20A main fuse
Functioning crank relay
Functioning neutral switch
Background
The neutral relay relays battery voltage to the starter solenoid.
Procedure
Follow the procedure below to check the neutral relay.
1. Open the hood and locate the neutral relay (a).
2. Place the key switch in the START position.
3. Check the voltage between terminal 30 (red wire #35) and ground. This test
may be done at the plug (b) with it disconnected from the neutral relay.
Is battery voltage (approximately 12V) measured?
4. Check the voltage between terminal 86 (black wire #31) and ground. This test
may be done at plug (b) with it disconnected from the neutral relay.
Is battery voltage (approximately 12V) measured?
5. Check the voltage between terminal 87 (black wire #20) and ground. For this
test, plug (b) must be connected to the crank relay. Position the plug as shown
to allow access to terminal 87.
Is battery voltage (approximately 12V) measured?
The neutral relay has now been checked.
Yes ____ No ____
Continue Repair red wire #35.
Yes ____ No ____
Continue Repair red wire #31.
Yes ____ No ____
The neutral relay is OK. The neutral relay has failed; replace it.
wc_gr003918
86
85
30
87
R 35
B 20
B 31
a
b
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