TROUBLESHOOTING [ENGINE CONTROL FS]
KOEO, KOER
P1474
DTC
P1479
Cooling fan control primary circuit malfunction
Condenser fan control primary circuit malfunction
DESCRIPTION
• DTC P1474 indicates cooling fan control primary circuit failure.
• DTC P1479 indicates condenser fan control primary circuit failure.
[Possible Cause]
• Open or shorted cooling fan control signal or condenser
• Damaged fan relay (cooling fan or condenser fan)
fan control signal circuit
• Damaged PCM
• Open VPWR circuit to fan relay
STEP
INSPECTION
ACTION
1
CHECK FOR POWER CIRCUIT TO
APPLICABLE FAN RELAY
Note
• During diagnosis, use below to determine
the correct pin number, circuit and relay
being tested.
• DTC P1474=PCM terminal 45
• DTC P1479=PCM terminal 17
• Key off.
• Disconnect appropriate fan relay.
• Key on.
• Measure voltage between power circuit at
applicable fan control relay connector and
battery negative post.
•
Is voltage greater than 10.5 volts?
Yes
Go to next step.
No
SERVICE open power circuit to applicable fan control
relay.
RECONNECT fan relay.
RERUN OBD Test.
2
CHECK FOR COOLING FAN CONTROL
SIGNAL OR CONDENSER FAN CONTROL
SIGNAL CIRCUIT CYCLING
• Key on, engine off.
• Applicable fan relay disconnected.
• NGS tester connected.
• Access Output Test Mode.
• Connect non-powered test lamp between
power circuit and cooling fan control signal
or condenser fan control signal circuit at
applicable fan relay connector.
• W hile observing test lamp, command
appropriate cooling fan speed on and off.
•
Does test lamp turn on and off when
cooling fan output is commanded on
and off?
Yes
Key off.
REPLACE appropriate fan relay.
RERUN OBD Test.
No
REPEAT test step to VERIFY results.
If test lamp still does not turn on and off as expected, turn
key off.
REMOVE test lamp.
Go to next step.
3
CHECK COOLING FAN CONTROL SIGNAL
OR CONDENSER FAN CONTROL SIGNAL
CIRCUIT FOR SHORT TO POWER
• Key off.
• Applicable fan control relay disconnected.
• Disconnect PCM. Inspect for damaged or
pushed out pins, corrosion and loose wires.
Service as necessary.
• Key on, engine off.
• Measure voltage between cooling fan
control signal or condenser fan control
signal circuit at applicable fan control relay
vehicle harness connector and battery
negative post.
• Key off.
• Was voltage less than 1.0 volt?
Yes
Go to next step.
No
SERVICE cooling fan control signal or condenser fan
control signal circuit short to power.
RECONNECT all components.
RERUN OBD Test.
01-01A -1 08
Содержание MX-6 1998
Страница 1: ......
Страница 501: ...STARTING SYSTEM 3 If not as specified replace the starter interlock switch 01 19 3...
Страница 803: ...MANUAL TRANSAXLE W 6 U 5 1 5 W A C 05 15 7...
Страница 934: ...CONTROL SYSTEM CONTROL SYSTEM STRUCTURAL VIEW W6U740WA0 07 40 2...
Страница 983: ...SERVICE TOOLS 08 60 SERVICE TOOLS 08 RESTRAINTS S S T 08 60 1 08 RESTRAINTS SST 08 60 1...
Страница 1005: ...TROUBLESHOOTING POWER DOOR LOCK SYSTEM From previous page Go to next page W 6 U 9 0 1 W H 3 09 01E 7...
Страница 1168: ...SEATS 4A 4 If not as specified replace the power seat switch 2A 2B t 4B 3A 1C 1A 1F W6U913WA9 09 13 7...