DTC P1129

DTC P1129  : MAP Sensor Signal Higher Than Expected

DTC (PGM-FI)

1. Vacuum leak check

   -1. Check for vacuum leaks in these parts:

   • PCV valve
   • PCV hose
   • EVAP canister purge valve
   • Throttle body
   • Intake manifold
   • Brake booster
   • Brake booster hose

   Are there any vacuum leaks?

   YES 

   Repair or replace the parts with vacuum leaks, then do the repair verification.

   NO 

   Go to step 2.

2. MAP sensor performance check

   -1. Start the engine. Hold the engine speed at 3000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.

   -2. Check the parameter(s) below with the HDS for 5 seconds.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   MAP SENSOR	More than 36.9	kPa

   Did the value maintain the malfunction threshold for 5 seconds or more?

   YES 

   Replace the MAP sensor , then do the repair verification.

   NO 

   Go to step 3.

3. Problem verification

   -1. Clear the DTC with the HDS.

   -2. Test-drive under these conditions:

   • Engine coolant temperature (ECT SENSOR 1) above 158 deg.F (70 deg.C)
   • Engine speed between 1400-6700 RPM
   • Transmission in D
   • Drive at a steady speed between 55-75 mph (90-120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for 5 seconds

   Signal	Current conditions
   	Values	Unit
   ECT SENSOR 1
   ENGINE SPEED
   VEHICLE SPEED

   -3. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS.

   DTC Description	OBD STATUS
   P1129 MAP Sensor Signal Higher Than Expected

   Does the HDS indicate FAILED?

   YES 

   The failure is duplicated. Replace the MAP sensor , then do the repair verification.

   NO 

   If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM. If the HDS indicates NOT COMPLETED, go to step 3-2 and recheck.

4. Repair verification (OBD STATUS check)

   -1. Turn the vehicle to the ON mode.

   -2. Reset the PCM with the HDS .

   Reset PCM

   -3. Do the PCM idle learn procedure .

   -4. Start the engine. Hold the engine speed at 3000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.

   -5. Test-drive under these conditions:

   • Engine coolant temperature (ECT SENSOR 1) above 158 deg.F (70 deg.C)
   • Engine speed between 1400-6700 RPM
   • Transmission in D
   • Drive at a steady speed between 55-75 mph (90-120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for 5 seconds

   Signal	Current conditions
   	Values	Unit
   ECT SENSOR 1
   ENGINE SPEED
   VEHICLE SPEED

   -6. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS.

   DTC Description	OBD STATUS
   P1129 MAP Sensor Signal Higher Than Expected

   Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?

   PASSED

   Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.

   FAILED

   Go to step 1 and recheck.

   NOT COMPLETED

   Meet the test conditions, and check the OBD STATUS again.