ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE) 6-1-71
Fig. for STEP 2, 3
4 HO2S heater control circuit check :
1) With ignition switch OFF, install HO2S
heater relay.
2) With ignition switch ON leaving engine OFF,
check voltage between C51-2-4 and
ground.
Is the voltage 10 – 14 V?
Substitute a known-good
ECM (PCM) and recheck.
Faulty HO2S heater relay
or “BLK” wire open, “BLU”
wire open or shorted to
ground circuit, “BLK/RED”
wire open or shorted to
ground circuit.
If OK, substitute a known-
good ECM (PCM) and
recheck.
Step Action Yes No
a. HO2S heater relay
To Next Page
Loading...
Need help?
General
