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EC-1320
[YD (WITH EURO-OBD)]
DTC P0686 ECM RELAY
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic Procedure BBS0023E
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 3.
NG >> GO TO 2.
2. DETECT MALFUNCTIONING PART
Check the following.
● Harness connectors F30, M63
● Harness for open or short between ECM and ECM relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
3. 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 5.
NG >> GO TO 4.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM CONDITION
DATA
(DC Voltage)
105
113
G
G
ECM relay (self-shutoff)
[Ignition switch ON]
[Ignition switch OFF]
● For a few seconds after turning ignition
switch OFF
Approximately 1.2V
[Ignition switch OFF]
● More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
107
108
W/R
W/R
Ignition switch [Ignition switch ON]
BATTERY VOLTAGE
(11 - 14V)
119
120
Y
R
Power supply for ECM [Ignition switch ON]
BATTERY VOLTAGE
(11 - 14V)
Continuity should not exist.
Continuity should exist.
PBIB1899E
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