Acura CL Integra NSX RL RSX TL TSX 2001-2006

TroubleCodes (7 of 15)

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2.0L L4 - Std



Trouble Code: P0662

Intake Manifold Runner Control Valve Position Sensor Circuit High Input

Trouble Code Conditions: Key on or engine running; and the PCM detected an unexpected high voltage condition on the IMRC Valve Position Sensor circuit.

Possible Causes:



IMRC valve position ground circuit is open
 
IMRC valve position sensor circuit shorted to VREF
 
IMRC valve position sensor circuit is shorted to system power
 
PCM has failed
 

Trouble Code: P0748

A/T Clutch Pressure Control Solenoid 'A' Circuit Malfunction

Trouble Code Conditions: Engine started, vehicle driven at cruise speed, and the PCM detected an unexpected voltage condition on the A/T Clutch Pressure control solenoid 'A' circuit during the CCM test period.

Possible Causes:



Clutch pressure control solenoid 'A' circuit is shorted to ground
 
Clutch pressure control solenoid 'A' is damaged or has failed
 
Clear codes and recheck for this trouble code. If it resets, update the PCM to the latest software. Then recheck for the same trouble code. If it resets, substitute a known good PCM to determine if the PCM has failed and is causing the code.
 

Trouble Code: P1077

Intake Manifold Runner Control System (Low RPM) Malfunction

Trouble Code Conditions: Engine started, vehicle driven at cruise speed and then back to idle speed, and the PCM detected a problem in the IMRC system at low engine speed during the CCM test. If P0651 is also set, repair it first.

Possible Causes:



IMRC component failure affecting low engine speed operation
 
IMRC solenoid is damaged or stuck at low engine speed
 
PCM has failed
 

Trouble Code: P1078

Intake Manifold Runner Control System (High RPM) Malfunction

Trouble Code Conditions: Engine started, vehicle driven at cruise speed and then back to idle speed, and the PCM detected a problem in the IMRC system at high engine speed during the CCM test.

Possible Causes:



IMRC component failure affecting high engine speed operation
 
IMRC solenoid is damaged or stuck at high engine speed
 
PCM has failed
 

Trouble Code: P1121

TP Sensor Signal Lower Than Expected

Trouble Code Conditions: Engine started, and the PCM detected the TP sensor was lower than the expected value with the throttle wide open (i.e., the Scan Tool reads less than 14.1% under these conditions) during the CCM Test.

Possible Causes:



TP sensor signal circuit is shorted to ground between the PCM and the TCM
 
TP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1122

TP Sensor Signal Higher Than Expected

Trouble Code Conditions: Engine started, and the PCM detected the TP sensor was more than the expected value with the throttle wide open (i.e., the Scan Tool reads more than 16.5% under these conditions) during the CCM Rationality test.

Possible Causes:



TP sensor signal circuit is open or shorted to VREF between the PCM and the TCM
 
TP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1128

MAP Sensor Signal Lower Than Expected

Trouble Code Conditions: Engine started, engine running at cruise speed and then back to idle speed, and the PCM detected a MAP sensor signal was less than the expected value during the CCM Rationality Test.

Possible Causes:



MAP sensor signal circuit shorted to ground (intermittent fault)
 
MAP sensor vacuum line bent or plugged at intake manifold
 
MAP sensor is damaged or it is out-of-calibration
 
PCM has failed
 

Trouble Code: P1129

MAP Sensor Value Higher Than Expected

Trouble Code Conditions: Engine started, engine running at cruise speed and then back to idle speed, and the PCM detected a MAP sensor signal was higher than the expected value during the CCM Rationality Test.

Possible Causes:



Check for signs of a vacuum leak at the PCV valve or hose, the engine mount vacuum hose, brake booster and throttle body
 
MAP sensor signal circuit shorted to VREF (intermittent fault)
 
MAP sensor is damaged or it is out-of-calibration
 
PCM has failed
 

Trouble Code: P1162

Air Fuel Sensor (Bank 1 Sensor 1) Circuit Malfunction

Trouble Code Conditions: DTC P0131, P0132, P0133, P1163 not set, vehicle driven while in closed loop at over 55 mph in D4 for 1-2 minutes, and the PCM detected an unexpected voltage condition on the A/F circuit during the HO2S Monitor test.

Possible Causes:



A/F sensor may be contaminated or may have failed
 
Fuel supply system is too lean (exhaust leaks in front of HO2S)
 
Fuel supply system is too rich (fuel filter is clogged or dirty)
 
PCM has failed
 

Trouble Code: P1163

Air Fuel Sensor (Bank 1 Sensor 1) Slow Response

Trouble Code Conditions: Engine at idle speed, then accelerated to 55 mph for 5 seconds, then back to idle speed for 5 seconds, and the PCM detected the A/F sensor response time was too slow, or the rich-lean or lean-rich response switch rate was too slow during the HO2S Monitor test.

Possible Causes:



A/F sensor may be contaminated or may have failed
 
Fuel supply system is too lean (exhaust leaks in front of LAF)
 
Fuel supply system is too rich (fuel filter is clogged or dirty)
 
PCM has failed
 
TSB 01-038 (10/29/01) contains a repair procedure for the code
 

Trouble Code: P1164

Air Fuel Sensor (Bank 1 Sensor 1) Range/Performance

Trouble Code Conditions: Engine speed over 1500 rpm in 4th gear in closed loop, then a quick acceleration to WOT, followed by a 5 second deceleration period with the throttle closed, and the PCM detected the A/F sensor response time or the R-L or L-R switch rate was too slow.

Possible Causes:



A/F sensor may be contaminated or may have failed
 
Fuel supply system too lean (exhaust leaks in front of the LAF)
 
Fuel supply system too rich (the fuel filter may be very dirty)
 
PCM has failed
 

Trouble Code: P1166

Air Fuel Sensor (Bank 1 Sensor 1) Heater Circuit Malfunction

Trouble Code Conditions: Engine runtime more than 80 seconds; and the PCM detected an unexpected voltage condition on the A/F sensor heater circuit.

Possible Causes:



A/F sensor heater circuit is open or shorted to ground
 
A/F sensor heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P1167

Air Fuel Sensor (Bank 1 Sensor 1) Heater Circuit Malfunction

Trouble Code Conditions: Engine runtime over 80 seconds, and the PCM detected an unexpected voltage condition on the A/F sensor Heater circuit.

Possible Causes:



A/F sensor heater power supply circuit is open (check the fuse)
 
A/F sensor heater circuit is shorted to system power (B+)
 
A/F sensor heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P1259

VTEC System Malfunction

Trouble Code Conditions: Engine running under hard acceleration, than back to road load, and the PCM detected a fault in the operation of the VTEC system.

Possible Causes:



VTEC solenoid control circuit is open or shorted to ground
 
VTEC solenoid is damaged or has failed
 
VTEC pressure switch circuit is open or shorted to ground
 
VTEC pressure switch is damaged or has failed
 
PCM has failed
 

Trouble Code: P1456

EVAP System Leak Detected (Fuel Tank Area)

Trouble Code Conditions: IAT sensor signal from 32-86ºF at startup, vehicle driven to a speed over 5 mph for 2-3 minutes, ECT sensor signal over 154ºF, then with the EVAP Control and Vent solenoids "on", the PCM detected an incorrect fuel tank pressure value due to a leak in the fuel tank area.

Possible Causes:



Fuel tank cap damaged, loose or the wrong part number
 
Fuel tank leaks at the fuel fill pipe or at the fuel tank seals
 
Fuel vapor control valve is damaged or has failed
 
Fuel tank vapor recirculation valve or vapor tube is damaged
 
Fuel tank vapor control vent tube is damaged or has failed
 
TSB 02-005 (2/18/02) contains a repair procedure for this code
 

Trouble Code: P1457

EVAP System Leak Detected (Canister Area)

Trouble Code Conditions: Cold startup completed (IAT sensor signal from 32-86ºF at engine startup), vehicle driven at over 5 mph for over 2 minutes, then with ECT sensor signal more than 154ºF and the EVAP Control and Vent solenoids enabled, and the PCM detected an invalid fuel tank pressure value due to a leak in the canister area in the Leak Test.

Possible Causes:



EVAP canister is leaking, damaged or full of water
 
EVAP canister purge line is loose, damaged or blocked
 
EVAP two-way valve or ORVR vent shut valve is damaged
 
EVAP fuel tank vapor control valve is damaged or has failed
 
PCM has failed
 
TSB 03-001 (1/27/03) contains a repair procedure for this code
 

Trouble Code: P1486

Cooling System Malfunction

Trouble Code Conditions: DTC P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0335, P0336, P0401, P0500, P0505, P1106, P1107, P1108, P1128, P1129, P1253, P1257, P1258, P1259, P1359, P1399, P1491, P1498 and P1519 not set, vehicle driven for over 10 minutes, and the PCM detected the ECT signal did not reach the correct closed loop value. Note: This trouble code can set if the engine remains under hot idle conditions with the hood open for an extended period of time.

Possible Causes:



ECT sensor is out of calibration
 
Check for low coolant level or incorrect coolant mixture
 
Cooling system component failure (thermostat stuck open)
 
TSB 01-016 (9/10/01) contains a repair procedure for this code
 

Trouble Code: P1519

Idle Air Control Valve Circuit Malfunction

Trouble Code Conditions: Key on or engine running; and the PCM detected an unexpected voltage condition on the Idle Air Control (IAC) valve control circuit.

Possible Causes:



IAC valve circuit is open, shorted to ground or to system power
 
IAC valve power circuit is open or shorted to ground
 
IAC valve is damaged or has failed
 
PCM is damaged
 
TSB 03-006 (3/17/03) contains a repair procedure for this code
 

Trouble Code: P1607

PCM Internal Circuit Malfunction

Trouble Code Conditions: Key on, and the PCM detected a fault in one of its internal circuits. Note: This trouble code indicates an internal failure in the PCM. The OEM repair procedure recommends replacing the original PCM with a "known good" PCM and then verify the code does not reset.

Possible Causes:



PCM is damaged or has failed
 

Trouble Code: U0073

FCAN Malfunction (BUS Off)

Trouble Code Conditions: DTC U0122 and U0155 not set; and a message from a learned ID number was not detected for the five seconds from the Vehicle Navigation Module (VTM) or the VSA control module.

Possible Causes:



Check for loose connections at the VSA control unit (intermittent fault)
 
Communication is open, shorted to ground or to B+
 
VSA has failed (substitute known good VSA and then retest)
 

Trouble Code: U0107

Lost Communication With TAC Module

Trouble Code Conditions: DTC U0122 and U0155 not set; and the PCM detected a problem in the FCAN communication circuit to the Vehicle Navigation Module (VTM) or the VSA control module.

Possible Causes:



Check for loose connections at the TAC control unit (intermittent fault)
 
FCAN communication circuit to the TAC is open, shorted to ground or B+
 
Throttle body assembly is damaged or has failed
 

Trouble Code: U0114

FCAN Malfunction (VTM-4 Control Module To PCM)

Trouble Code Conditions: DTC U0073 not set; and the PCM detected a problem in the FCAN communication circuit to the Vehicle Navigation Module (VTM) or the VSA control module.

Possible Causes:



Check for loose connections at VTM-4 unit (intermittent fault)
 
Check for any Body Control Module trouble codes
 
FCAN communication circuit to the VTM-4 is open, shorted to ground or B+
 

Trouble Code: U0122

FCAN Malfunction (VAS To PCM)

Trouble Code Conditions: DTC U0155 not set; and the PCM detected a problem in the FCAN communication circuit to the Fuel Control Module (FCM).

Possible Causes:



Check for loose connections at the VSA control unit (intermittent fault)
 
FCAN communication circuit to the VSA is open, shorted to ground or B+
 
VSA has failed (substitute known good VSA and then retest)
 

 
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