P1155
P1155 Limp Home Valve-Mal
Component Location
General Description
The Electronic Throttle System (ETS) consists of ETS unit, ETS-motor, Accelerator Position Sensor (APS),Throttle Position Sensor (TPS) and Limp home valve. Among above-mentioned parts, Limp home valve is attached under the throttle body and helps air to flow from the outside through this valve to the engine combustion chamber to prevent the vehicle from engine stall when PCM detects ETS system malfunction.
DTC Description
This DTC is set if the limp home valve is opened abnormally.
DTC Detecting Condition
Specification
Schematic Diagram
Terminal and Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES
1) Repair as necessary and then go to "Verification of Vehicle Repair" procedure
NO
1) Go to "Power Circuit Inspection" procedure.
Power Supply Circuit Inspection
Check Power to Limp Home Valve (LHV)
1. Ignition "OFF"
2. Disconnect Limp Home Valve connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between terminal "1" of the Limp Home Valve harness connector and chassis ground.
A. Specification: approx. B+
5. Is the voltage within specifications?
YES
1) Go to "Control Circuit Inspection" procedure.
NO
1) Check for open or short to chassis ground in harness between the main relay and the limp home valve, Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
Control Circuit Inspection
Check for Open in Harness
1. Ignition "OFF"
2. Disconnect Limp Home Valve connector and PCM connector.
3. Measure resistance between terminal "2" of the limp home valve harness connector and "A5" of the PCM harness connector.
A. Specification: Approx. 0 ohms
4. Is the resistance within specifications?
YES
1) Go to "Check for Short to Ground in Harness" as below.
NO
1) Check for open in control harness, Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
Check for Short to Ground in Harness
1. Ignition "OFF"
2. Disconnect Limp Home Valve connector and PCM connector.
3. Measure resistance between terminal "2" of the limp home valve harness connector and chassis ground.
A. Specification: infinite
4. Does the resistance indicate open?
YES
1) Go to "Component Inspection" procedure.
NO
1) Check for short to chassis ground in control harness, Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
Component Inspection
Check Limp Home Valve
1. Ignition "OFF"
2. Disconnect limp home valve connector.
3. Measure resistance between terminal "1" and "2" of the limp home valve connector.
A. Specification: Approx. 7.7 ~ 9.3 ohms at 20�C(68�F)
4. Is the resistance within specifications?
YES
1) Substitute with a known-good PCM and check for proper operation. If the problem is corrected,replace PCM and then go to "Verification of Vehicle Repair" procedure.
NO
1) Check limp home valve for contamination, deterioration, or damage. Substitute with a known-good limp home valve and check for proper operation.If the problem is corrected, replace limp home valve and then go to "Verification of vehicle Repair" procedure. If the throttle body assembly with the limp home valve needs to be replaced, do initialization after it is replaced.
Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected
1. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code (DTC) which has been diagnosed
2. Using a Scantool, Clear DTC.
3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions
4. Monitor that all readiness test have been verified as "Complete"
5. Are any DTCs present ?
YES
1) Go to the applicable troubleshooting procedure.
NO
1) System is performing to specification at this time.