Suzuki WagonR+ RB310 Service Manual page 1850

INSPECTION
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Check EFE Heater and Its Circuit.
Check for voltage at terminal E23-12 of ECM (PCM)
connector connected, under following each
condition.
During engine warming up (Coolant temp.:
Below 80_C, 176_F, Engine speed: Over 750 r/min):
Over 1.0 V
After warming up: Below 1.0 V
Is each voltage as specified?
3 Check EFE Heater Relay.
1) Turn OFF ignition switch and remove EFE heater
relay ("PTC"). See Fig. 2.
2) Check for proper connection to relay at terminal
3 and 4. See Fig. 3.
3) Check resistance between each two terminals.
Between terminals 1 and 2: Infinity
Between terminals 3 and 4: 100 – 120 Ω
4) Check that there is continuity between terminals
1 and 2 when battery is connected to terminals
3 and 4. See Fig. 4.
Is EFE heater relay in good condition?
4 Check EFE Heater and Its Circuit.
1) Turn ignition switch OFF and disconnect ECM
(PCM) connectors.
2) Check for proper connection to ECM (PCM) at
terminals E21-25 and E23-12.
3) If OK, then measure resistance between terminal
E23-12 and ground.
Is it 0.5 – 30 Ω at 20_C (68_F)?
Fig 1. for Step 4
Fig. 4 for Step 3
ACTION
Fig. 2 for Step 3
GENERAL INFORMATION AND ENGINE DIAGNOSIS 6-1-87
YES
Go to Step 2.
Intermittent trouble.
Check for intermittent
referring to
"Intermittent and Poor
Connection" in
Section 0A.
Go to Step 4.
"WHT /BLU",
"RED/WHT" or "WHT"
circuit open or short.
If wire and
connections are OK,
substitute a known-
good ECM (PCM) and
recheck.
Fig. 3 for Step 3
1. EFE heater
relay
NO
Go to "ENGINE DIAG.
FLOW TABLE".
Go to Step 3.
Replace EFE heater
relay.
"RED/WHT" circuit
open or short.
If wire and
connections are OK,
replace EFE heater.