Captiva |
||||||||
|
|
|
|||||||
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
5-Volt Reference | P0122, P0222, P0651 | P0122, P0222, P2135 | P0123, P0223, P0651 | - |
TP Sensor 1 Signal | P0122 | P0122, P2135 | P0123 | P0068, P0121 |
TP Sensor 2 Signal | P0222 | P0222, P2135 | P0223 | P0068, P0121 |
Low Reference | - | P0123, P0223, P2135 | - | - |
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running at various operating conditions Normal Range: 4.75-0.35 V | |||
5 V Reference | 0 V | 0 V | 5 V |
TP Sensor 1 Signal | 0 V | 0 V | 5 V |
Low Reference | - | 5 V | - |
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: 0.25-4.59 V | |||
5 V Reference | 0 V | 5 V | 5 V |
TP Sensor 2 Signal | 0 V | 0 V | 5 V |
Low Reference | - | 5 V | - |
The throttle body assembly contains 2 throttle position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable. The TP sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies the TP sensors with a common 5 V reference circuit, a common low reference circuit, and 2 independent signal circuits.
The TP sensors have opposite functionality. TP sensor 1 signal voltage decreases and TP sensor 2 signal voltage increases as the accelerator pedal increases to wide open throttle (WOT).
| • | DTC P0641 or P0651 is not set. |
| • | The run/crank or powertrain relay voltage is greater than 6 V and reduced power is not active. |
| • | The ignition is ON or the engine is operating. |
| • | The DTCs run continuously when the above conditions are met. |
| • | DTC P0120, P0122, P0123, P0220, P0222, P0223, P0641, or P0651 is not set. |
| • | The run/crank or powertrain relay voltage is greater than 6 V and reduced power is not active. |
| • | The ignition is ON or the engine is operating. |
| • | DTC P2135 runs continuously when the above conditions are met. |
Throttle position sensor 1 voltage is less than 0.325 V or greater than 4.7 V for greater than 1 s.
The ECM detects that the throttle position sensor 1 voltage is less than 0.32 V for greater than 1 s.
The ECM detects that the throttle position sensor 1 voltage is greater than 4.75 V for greater than 1 s.
The throttle position sensor 2 voltage is less than 0.25 V or greater than 4.59 V for greater than 1 s.
The ECM detects that the throttle position sensor 2 voltage is less than 0.25 V for greater than 1 s.
The ECM detects that the throttle position sensor 2 voltage is greater than 4.59 V for greater than 1 s.
The difference between the throttle position sensor 1 and throttle position sensor 2 exceeds a predetermined value for greater than 2 s.
| • | DTCs P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs. |
| • | The control module commands the TAC system to operate in the Reduced Engine Power mode. |
| • | A message center or an indicator displays Reduced Engine Power. |
| • | Under certain conditions the control module commands the engine OFF. |
DTCs P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.
| • | If the Throttle Sweep Test is not available on the scan tool, observe the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter while performing the following tests: |
| - | Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times. |
| - | Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the procedure several times. |
| The Throttle Position Sensors 1 and 2 Agree/Disagree parameter should display Agree. If Disagree is displayed, continue diagnosis in Circuit/System Testing. |
| • | A high resistance condition on the throttle position and throttle actuator control circuits could cause a DTC to set. |
Throttle Actuator Control (TAC) System Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
| ⇒ | If a DTC is set, refer to DTC P0641 or P0651 |
Note: If the Throttle Sweep Test is not available on the scan tool, use the accelerator to perform the test. Refer to Diagnostic Aids for further details.
| ⇒ | If DTC P0120 or P0220 are the only DTCs set, replace the ECM. |
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
| ⇒ | If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM. |
Perform the Diagnostic Repair Verification after completing the repair.
| • | Throttle Body Assembly Replacement : LE5 or LE9 |
| • | Control Module References for ECM replacement, programming and setup |
| © Copyright Chevrolet. All rights reserved |
