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Home >> Chrysler >> 2001 >> Intrepid Base >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Diagnostic Tests >> DTC P1597: Speed Control Switch Always Low >> Possible Causes

Possible Causes

  1. Turn ignition off. Connect scan tool to DLC. Turn ignition on. Using scan tool, read SPEED CONTROL voltage. If voltage is less than one volt, go to next step. If voltage is one volt or more, go to step  6 .
  2. Turn ignition on. Observe scan tool SPEED CONTROL voltage. Disconnect S/C ON/OFF switch 2-pin connector. If voltage changes to more than 4.7 volts, replace S/C ON/OFF switch. See SPEED CONTROL SWITCHES  under REMOVAL & INSTALLATION. Perform POWERTRAIN VERIFICATION TEST VER-4  under VERIFICATION TESTS. If voltage does not change to more than 4.7 volts, go to next step.
  3. Ensure S/C ON/OFF switch 2-pin connector is properly connected. Observe scan tool SPEED CONTROL voltage. Disconnect S/C ACCEL/RESUME switch 2-pin connector. If voltage changes to more than 4.7 volts, replace S/C ACCEL/RESUME switch. See SPEED CONTROL SWITCHES  under REMOVAL & INSTALLATION. Perform POWERTRAIN VERIFICATION TEST VER-4  under VERIFICATION TESTS. If voltage does not change to more than 4.7 volts, leave S/C ACCEL/RESUME switch connector disconnected and go to next step.
  4. Turn ignition off. Disconnect S/C ON/OFF switch 2-pin connector. Disconnect PCM connectors. Measure resistance between PCM connector C2 terminal No. 41, S/C switch signal circuit (Red/Light Green wire) and terminal No. 43, sensor ground circuit (Black/Light Blue wire). See Figure . If resistance is less than 5 ohms, repair Red/Light Green wire for short to Black/Light Blue wire. Perform POWERTRAIN VERIFICATION TEST VER-4  under VERIFICATION TESTS. If resistance is 5 ohms or more, leave connectors disconnected and go to next step.
  5. Measure resistance between ground and PCM connector C2 terminal No. 41, S/C switch signal circuit (Red/Light Green wire). If resistance is less than 5 ohms, repair short to ground in Red/Light Green wire. Perform POWERTRAIN VERIFICATION TEST VER-4  under VERIFICATION TESTS. If resistance is 5 ohms or more, replace PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Perform POWERTRAIN VERIFICATION TEST VER-4  under VERIFICATION TESTS.
  6. Conditions required to set DTC are not present at this time. Fault may be intermittent. Using scan tool, check freeze frame data to determine conditions when DTC set. Monitor scan tool while wiggling related wiring and connectors. See WIRING DIAGRAMS  . Check related wiring and connectors for poor connections or damage to wiring harness. Repair any problems found as necessary. Perform POWERTRAIN VERIFICATION TEST VER-4  under VERIFICATION TESTS. If no problems are found, check if any Technical Service Bulletins (TSBs) apply to vehicle. If no TSBs apply, test is complete.
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