Subsection XX (DIAGNOSTIC AND FAULT CODES)
PCODE
MODULE
DESCRIPTION
CAUSE
ACTION
P0685
ECM
Accessory relay
circuit
diagnosis related to
Accessories or Light relay,
Blown fuse, damaged
or disconnected relay,
damaged circuit wires,
damaged connectors or
damaged ECM output pins
Check fuse
Disconnect Accessory relay
and Lights relay & turn
key switch (on w/lights)
Measure voltage between harness
connector PF1-10E and ground.
(Expected value: 11 to 13 volts)
Measure voltage between harness
connector PF1-6D and ground.
(Expected value: 11 to 13 volts)
Measure resistance from harness
connector: ECM-K2 to PF1-12D
(Expected value: < 2 ohms)
Measure resistance from harness
connector: ECM-K2 to PF1-7C
(Expected value: < 2 ohms)
Measure resistance between
terminals 85 and 86 on the 2 relays.
(Expected value: 70 to 90 ohms)
P0686
ECM
Accessory relay
circuit shorted to
ground or open
circuit
diagnosis related to
Accessories or Light relay,
Blown fuse, damaged
or disconnected relay,
damaged circuit wires,
damaged connectors or
damaged ECM output pins
Check fuse
Disconnect Accessory relay
and Lights relay & turn
key switch (on w/lights)
Measure voltage between harness
connector PF1-10E and ground.
(Expected value: 11 to 13 volts)
Measure voltage between harness
connector PF1-6D and ground.
(Expected value: 11 to 13 volts)
Measure resistance from harness
connector: ECM-K2 to PF1-12D
(Expected value: < 2 ohms)
Measure resistance from harness
connector: ECM-K2 to PF1-7C
(Expected value: < 2 ohms)
Measure resistance between
terminals 85 and 86 on the 2 relays.
(Expected value: 70 to 90 ohms)
P0687
ECM
Accessory relay
circuit shorted to
b
diagnosis related to
Accessories or Light relay,
Damaged relay,
damaged circuit wires,
damaged connector or
damaged ECM output
pins.
Check fuse
Disconnect Accessory relay
and Lights relay & turn
key switch (on w/lights)
Measure voltage between harness
connector PF1-10E and ground.
(Expected value: 11 to 13 volts)
Measure voltage between harness
connector PF1-6D and ground.
(Expected value: 11 to 13 volts)
Measure resistance from harness
connector: ECM-K2 to PF1-12D
(Expected value: < 2 ohms)
Measure resistance from harness
connector: ECM-K2 to PF1-7C
(Expected value: < 2 ohms)
Measure resistance between
terminals 85 and 86 on the 2 relays.
(Expected value: 70 to 90 ohms)
16
vmr2015