Valve cover replacement nightmare, please help.
#16
#17
I see your point but those codes were present before the tps was replaced. Not only that but what else would be causing the tps and the camshaft position sensors(both) to be coding?
#18
#19
Premier Member
iTrader: (11)
What year is your car? Step number 1, download the FSM: http://www.nicoclub.com/FSM/G35/Coupe/2004/ec.pdf
P0300 = MULTI CYL MISFIRE
Listed possible causes in previous post
P1121 = ETC ACTR (Electric throttle control actuator)
Possible cause: Electric throttle control actuator
P1122 = ETC FUNCTION/CIRC (Electric throttle control performance problem)
Possible cause: Harness or connectors (Throttle control motor circuit is open or
shorted)
Electric throttle control actuator
NOTE: If DTC P1122 is displayed with DTC P1121 or 1126, first perform the trouble diagnosis for DTC P1121 or P1126.
P1123 = doesn't exist. If is really P1128, then that is Throttle control motor circuit short
P0123 = TP SEN 2/CIRC (Throttle position sensor 2 circuit high input)
Possible cause:
* Harness or connectors
(TP sensor 2 circuit is open or shorted.) (APP sensor 2 circuit is shorted.)
*Electric throttle control actuator (TP sensor 2)
*Accelerator pedal position sensor (APP sensor 2)
Since P1121, Throttle Control Actuator is the primary failure here, here's the diag procedure:
1. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
a. Remove the intake air duct.
b. Check if a foreign matter is caught between the throttle valve and the housing.
OK or NG
OK >> GO TO 2.
NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.
2. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
a. Replace the electric throttle control actuator.
b. Perform EC-42, "Throttle Valve Closed Position Learning" .
c. Perform EC-42, "Idle Air Volume Learning" .
P0300 = MULTI CYL MISFIRE
Listed possible causes in previous post
P1121 = ETC ACTR (Electric throttle control actuator)
Possible cause: Electric throttle control actuator
P1122 = ETC FUNCTION/CIRC (Electric throttle control performance problem)
Possible cause: Harness or connectors (Throttle control motor circuit is open or
shorted)
Electric throttle control actuator
NOTE: If DTC P1122 is displayed with DTC P1121 or 1126, first perform the trouble diagnosis for DTC P1121 or P1126.
P1123 = doesn't exist. If is really P1128, then that is Throttle control motor circuit short
P0123 = TP SEN 2/CIRC (Throttle position sensor 2 circuit high input)
Possible cause:
* Harness or connectors
(TP sensor 2 circuit is open or shorted.) (APP sensor 2 circuit is shorted.)
*Electric throttle control actuator (TP sensor 2)
*Accelerator pedal position sensor (APP sensor 2)
Since P1121, Throttle Control Actuator is the primary failure here, here's the diag procedure:
1. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
a. Remove the intake air duct.
b. Check if a foreign matter is caught between the throttle valve and the housing.
OK or NG
OK >> GO TO 2.
NG >> Remove the foreign matter and clean the electric throttle
control actuator inside.
2. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
a. Replace the electric throttle control actuator.
b. Perform EC-42, "Throttle Valve Closed Position Learning" .
c. Perform EC-42, "Idle Air Volume Learning" .
The following users liked this post:
jsmith29 (11-09-2012)
#20
LoSt180 every sensor has been replaced and reset that you have listed. I'm still getting the same codes. My mech believes it to be electrical. Something in the engine harness has a break in it. I don't know if it would be cheaper to find the wires causing the problems or replace the engine wiring harness?
#21
Premier Member
iTrader: (11)
The "Throttle Control Actuator" is commonly called the throttle body. Since that has been replaced, I'd verify it's good (if used might have also been bad), then I'd get a multi-meter and start checking resistance and voltage measurements per the FSM instructions that I linked above.
If you have to pay someone to check the wires for you, then it comes down to a cost analysis of how many hours to pay a mechanic vs how much a harness costs. I just hope a short didn't cause damage to the ECM.
If you have to pay someone to check the wires for you, then it comes down to a cost analysis of how many hours to pay a mechanic vs how much a harness costs. I just hope a short didn't cause damage to the ECM.
#22
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