Tech Tip: Pontiac Sunfire Loses Fire

Tech Tip: Pontiac Sunfire Loses Fire

The Instrument Panel Cluster may have failed to recognize the Ignition Lock Cylinder. Your scan tool should indicate that a DTC P1629 is stored. The flow chart for P1629 will direct a scan tool to be used to access Instrument Panel Cluster (IPC) codes. This is the best way to perform diagnostics on this problem. However, if you’re using a scan tool that isn't capable of retrieving IPC codes or viewing data, try the following procedure.

Vehicle:
1996-1999 Sunfire 2.2L or 2.4L.

Problem 1 of 3:
The Instrument Panel Cluster may have failed to recognize the Ignition Lock Cylinder.

Test & Fix
Your scan tool should indicate that a DTC P1629 is stored. The flow chart for P1629 will direct a scan tool to be used to access Instrument Panel Cluster (IPC) codes. This is the best way to perform diagnostics on this problem. However, if you’re using a scan tool that isn’t capable of retrieving IPC codes or viewing data, try the following procedure.

Disconnect the wires from the Ignition Lock Cylinder. Turn the ignition key to the key on engine off (KOEO) position. Using a voltmeter, check voltage on the white wire to ground; it should read 12 volts. Then check the voltage on the yellow wire to ground; This should read 5 volts. Also, check the black wire being sure there is a good ground on this wire. The wires come from the IPC. If there is a loss of ground on the black wire or if voltage is missing on the white or yellow wires, check the power and ground for the IPC and connections at the IPC. If the powers and grounds and the connections and wiring between the IPC and ignition lock cylinder are OK, the IPC will need to be sent out for repair. If the voltages are correct, then continue testing by proceeding to step 2.

Problem 2 of 3:
The Ignition Lock Cylinder failed to change the voltage on the yellow wire.

Test & Fix
With the Ignition Lock Cylinder electrically reconnected, back-probe the yellow wire with the positive lead of the voltmeter and connect the negative lead to a known-good ground. Insert the ignition key in the lock cylinder and rotate the key to the start position, then release the key allowing it to return to the KOEO position.

During the time the key was rotated to the start position then released to the KOEO position, the voltage on the yellow wire should change from 5 volts to a lower value. Because there are 10 different voltage values, we are unable to give a specific voltage value. However, what the voltmeter should indicate is a lower change in the voltage value. If this change in voltage did not take place, the Ignition Lock Cylinder will need to be replaced and the Instrument Panel Cluster will need to be relearned afterwards. For the theft system relearn procedure, go to step 3.

Problem 3 of 3:
A component related to the theft system has been replaced and the password needs to be learned.

Test & Fix
Should the password be lost from the theft system because the battery was disconnected or a theft system-related component was replaced, the following procedure will need to be followed.

Attempt to start the vehicle, then without shutting the key off, leave the ignition key in the on position for 11 minutes. While the key is on, the theft system tell-tale will flash. When the theft system tell-tale stops flashing and is on solid, the engine should start.

Courtesy of Identifix’s Direct-Hit.

For additional information, visit www.identifix.com.

You May Also Like

Clarios Formalizes Joint Development Agreement with Altris

Altris will develop sodium ion cells for low-voltage tech while Clarios will lead in battery management systems, software, and system integration for battery design.

Clarios and Altris, a Swedish developer and prototype manufacturer of sodium-ion batteries, announced an exclusive Joint Development Agreement (JDA) for low-voltage mobility applications.

Under the new JDA, Altris will focus on developing the sodium ion cell technology for low-voltage applications, while Clarios will leverage its expertise in Battery Management Systems (BMS), software, and system integration to design the battery system. This development agreement enhances a collaboration agreement initiated earlier this year, which set in motion the creation of a detailed production plan for low-voltage vehicle batteries utilizing sodium-ion cells, the companies said.

Less is More with Cordless Work Lights

The automotive industry has reaped the benefits of LED lights more than any other industry.

Streamlight Wedge XT
Eaton to Supply ELocker Differential System to EV Manufacturer

The system leverages an electric motor to power the rear wheels and an electric motor or an optional ICE driving the front wheels.

Servicing EVs in Your Shop

Technicians need to learn how to correctly diagnose and repair electrical systems.

technician using laptop
Tool Time Podcast: Schrader TPMS

In this episode, Nadine and Eric sit down with Yanick Leduc to discuss all the TPMS solutions his company has to offer.

Other Posts

Eli Opens Reservations for its Micro-EV in the US

The new Eli ZERO represents a new category of high-tech, efficient and sustainable micro-EVs, according to Eli Electric Vehicles.

Hunter Engineering Releases New Alignment Coverage

Semi-annual specification update includes new and existing records.

#11 LED Work Lights

Light emitting diodes (LEDs) were a revolutionary development of electrical science.

LED Work Lights Feature
Eaton Receives 2024 Automotive News PACEpilot Award

Eaton was recognized for its 4-speed electrified vehicle transmission.