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DTC P0686 ECM RELAY
EC-1401
[YD (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Diagnostic Procedure EBS01237
1. CHECK ECM OUTPUT SIGNAL CIRCUIT FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 105, 113 and ground.
Refer to Wiring Diagram.
OK or NG
OK >> GO TO 2.
NG >> Repair short to ground in harness or connectors.
2. CHECK ECM INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM relay.
2. Check harness continuity between ECM terminal 119 and ECM
relay terminal 5, ECM terminals 120 and ECM relay terminal 7.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
3. CHECK ECM RELAY
Refer to EC-1401, "
Component Inspection" .
OK or NG
OK >> GO TO 4.
NG >> Replace ECM relay.
4. CHECK INTERMITTENT INCIDENT
Refer to EC-1260, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component Inspection EBS01238
ECM RELAY
1. Apply 12V direct current between ECM relay terminals 1 and 2.
2. Check continuity between relay terminals 3 and 5, 6 and 7.
3. If NG, replace ECM relay.
Continuity should not exist.
Continuity should exist.
PBIB1899E
Condition Continuity
12V direct current supply between ter-
minals 1 and 2
Yes
OFF No
PBIB0077E
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