Owner's Problem Description
The owner of a 1998 Dodge Intrepid reported intermittent starting issues, where the car would only start occasionally. After the battery died, it was replaced, but now the car won't crank at all, only producing a clicking noise from the relay box. The owner tested the starter relay voltage at 12 volts, indicating it is fine, but the vehicle still does not start. They suspect the ignition switch or a security feature might be causing the issue.
Professional Technical Analysis
The 1998 Dodge Intrepid is experiencing a no-crank condition after a previous intermittent starting issue and battery replacement. The vehicle exhibits a clicking sound from the relay box when the ignition is turned on. Voltage at the starter relay measures 12 volts, indicating the relay is functioning correctly. The clicking noise suggests that the starter solenoid may not be receiving adequate voltage or there could be an issue with the starter motor itself. A common failure pattern for these vehicles includes starter motor failure or poor electrical connections at the battery or starter. Given that the vehicle had a dead battery, it is also possible that a security feature was triggered, especially if the valet key was used instead of the master key. This model typically requires stable voltage to the starter for proper operation, with specifications of 12V at the solenoid during crank. The owner also mentioned a P1490 code, which relates to the evaporative emissions system but may not directly impact starting. However, if the vehicle's computer was temporarily disabled due to the use of the valet key, this would prevent the vehicle from starting until the system is reset or reprogrammed. The current condition indicates a need for thorough electrical testing and verification of key programming status to ensure all systems are operational.
Possible Causes
Most common causes (ordered by frequency):
- Starter Motor Failure: The starter motor may have developed an internal fault preventing it from engaging. Typical symptoms include a clicking noise from the relay and no crank. The starter should draw approximately 150-200 amps during engagement. Common failures include worn brushes or a faulty solenoid. A bench test can confirm the starter's operational status before replacement. - Clicking noise from relay box, failure to engage, draw test indicates insufficient current.
- Ignition Switch Malfunction: A faulty ignition switch may not be providing the necessary voltage to the starter circuit. The ignition switch should output 12V when in the 'Start' position. Testing across the switch terminals can help identify failure. This issue is common in older vehicles and can prevent the starter from receiving power. - No voltage at starter relay when ignition is turned, continuity test shows open circuit in switch.
- Security System Activation: If the vehicle was attempted to be started multiple times with the valet key, the security system may have disabled the starter. In this scenario, a reset procedure or using the master key is necessary to re-enable the system. This is a known issue in this model and can result in a no-start condition. - Valet key used, security indicator light flashing, reset required for starter reactivation.
Diagnostic Steps
Professional Diagnosis Process
Follow these systematic steps to accurately diagnose the issue. Each step builds on the previous one to ensure accurate diagnosis.
- STEP 1 - Initial Voltage Check: Begin by measuring the voltage at the starter relay while the ignition is in the 'Start' position. This should be around 12 volts. If there's no voltage, the issue may be related to the ignition switch or wiring. Ensure that the battery connections are clean and tight, as poor connections can lead to voltage drops.
- STEP 2 - Ignition Switch Testing: Test the ignition switch by measuring voltage at its output terminals when in the 'Start' position. If voltage is absent, the ignition switch may be faulty. Continuity tests can also help confirm if the switch is operating correctly.
- STEP 3 - Starter Motor Bench Test: If the relay and ignition switch are functioning correctly, remove the starter motor and perform a bench test. This will check for internal failures such as worn brushes or a faulty solenoid. A good starter should engage smoothly and draw the correct current.
- STEP 4 - Security System Reset: If the valet key was used, consult the vehicle's manual for the reset procedure to allow the starter to function again. This may involve turning the ignition on and off in a specific sequence or waiting for a certain time period.
