Captiva |
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• | 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 |
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Trans Mode Switch B Signal | P071D | -- | -- | P071D |
The engine control module (ECM) supplies 5 V reference voltage, through the 5 V reference voltage circuit, to the fuel economy mode switch. The 5 V reference voltage causes current to flow through a series of resistors in the switch to the switch ground circuit. The ECM also supplies a signal circuit to detect voltage within the resistor network. When the fuel economy mode switch button is momentarily pressed, the switch contacts allow the current to by-pass one of the resistors. The ECM detects the resulting change in voltage drop as a fuel economy mode request and sends a GMLAN message to the transmission control module (TCM) indicating the request. When the TCM receives the request, and if operating conditions are correct, the transmission shift points are modified to optimise fuel efficiency. The TCM sends a confirmation message to the ECM and the instrument panel cluster (IPC) also receives the fuel economy mode request message from the TCM and illuminates the fuel economy mode indicator lamp.
• | The engine speed is greater than 500 RPM for 5 seconds. |
• | Ignition voltage is between 9.0 volts and 19.0 volts. |
The TCM detects that the Economy Mode Switch has been continuously activated for 10 minutes.
• | DTC P071D is a type C DTC. |
• | The TCM inhibits the sport mode shift pattern. |
• | The TCM inhibits Tap Up/Down function. |
• | The TCM inhibits manual shifting of forward gears. |
DTC P071D is a Type C DTC.
Diagnose all communication and body DTCs first.
Automatic Transmission Controls Schematics
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance and repair as necessary. |
⇒ | 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 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 ECM. |
⇒ | If the parameter does not display the specified value, test the signal circuit for a short-circuit to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If the parameter does not display the specified value, test the signal circuit for an open/high resistance or a short-circuit to ground. If the circuit tests normal, replace the ECM. |
⇒ | If not the specified value, replace the economy mode switch |
⇒ | If not the specified value, replace the economy mode switch. |
⇒ | If not the specified value, replace the economy mode switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement
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