Ðề: Cần tư vấn lỗi lacety 2006
Fault Code: 1661
Circuit Index: PCED
Condition Description: OCC signal low
Comments: Aborts KOEO OCC test
Probable Causes: Low system voltage, internal PCM fault
I couln't find this on my PCED CD, but found it here on the FAQ's. Cheers!
More from 96 PCED:
DTC 1661 indicates that the output circuit check is low.
Possible causes:
-- Low battery voltage
-- Circuit failure
-- Faulty powertrain control module (PCM)
<ul type="square"> Perform charging system and battery tests.
Is charging system OK?[/list]
Yes
GO to «AS2».
No
REPAIR charging system as required.
AS2 VREF CIRCUIT CHECK
<ul type="square"> Disconnect PCM. Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
Install breakout box, leave PCM disconnected.
Disconnect manifold absolute pressure (MAP) sensor connector.
Measure resistance from Pin 90 to VREF Circuit 351 (BR/W) at the MAP sensor connector.[/list]
Is resistance less than 5 ohms?
Yes
GO to «AS3».
No
IDENTIFY VREF circuit fault. GO to Pinpoint Test «B1».
AS3 VPWR CIRCUIT CHECK
<ul type="square"> PCM disconnected.
Key on.
Measure resistance from Pins 71 and 97 to the positive battery post.
Is resistance less than 5 ohms?[/list]
Yes
GO to «AS4».
No
IDENTIFY VPWR circuit failure. GO to Pinpoint Test «A1».
AS4 PCM GROUND CIRCUIT CHECK
<ul type="square"> PCM disconnected.
Key off.
Measure resistance from Pins 25, 51, 76, 77 and 103 to the negative battery post.
Is resistance less than 5 ohms?[/list]
Yes
REPLACE PCM. RETEST system.
No
REPAIR ground circuit fault. GO to Pinpoint Test «A10».
A10 CHECK PWR GND CIRCUIT CONTINUITY
<ul type="square"> Key off.
Install breakout box. Leave PCM disconnected. Inspect for damaged or pushed-out pins.
Measure resistance between battery negative post and Test Pins 25, 51, 76, 77 and 103 at the breakout box.
Is each resistance less than 5.0 ohms?[/list]
Yes
F-Series, GO to «A11». Econoline, GO to «A14».
No
SERVICE open in PWR GND circuit. REMOVE breakout box. RECONNECT PCM. RERUN Scan Tool Diagnostic Test.
A11 CHECK PCM RELAY
<ul type="square"> Key off.
Disconnect maxi fuse 9.
Install PCM relay.
Breakout box install, PCM disconnected.
Key on, engine off.
Measure resistance between nonpower side of maxi fuse 9 to Test Pins 71 and 97.
Is resistance less than 5 ohms?[/list]
Yes
If fault is still present, REPLACE PCM.
No
REPLACE PCM relay.
It keeps going! Let me know if you need more if not listed.
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