DTC P1662 Cruise Control Inhibit Output Circuit. Chevrolet Monte Carlo 1998

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1998 🢒 Monte Carlo 🢒 DTC 🢒 DTC P1662 Cruise Control Inhibit Output Circuit

Engine Controls Components
VSS, Cruise
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

Output Driver Modules (ODMs) are used by the PCM to turn on many of the current-driven devices that are needed to control various engine and Transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON. DTC P1585 set indicates an improper voltage level has been detected on the output circuit which controls the stepper motor cruise control inhibit circuit.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

•	An improper voltage level has been detected on the output circuit which controls the cruise control inhibit.

•	The above conditions present for at least 30 seconds.

Action Taken When the DTC Sets

•	The PCM will not illuminate the malfunction indicator lamp (MIL).

•	The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data.

Conditions for Clearing the MIL/DTC

•	A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

•	The DTC can be cleared by using the scan tool Clear Info function.

Diagnostic Aids

Check for the following conditions:

•	Poor connection at the PCM. Refer to Intermittents and Poor Connections Diagnosis .

Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. Refer to Intermittents and Poor Connections Diagnosis .

•	Damaged harness. Refer to Wiring Repairs .

Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a digital multimeter connected between the cruise control inhibit control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the stepper motor cruise control module. A change in voltage will indicate the location of the malfunction. Refer to Wiring Repairs .

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Test Description

The numbers below refer to the step numbers on the Diagnostic Table:

Normally, ignition feed voltage present on the output driver circuit with the PCM disconnected and the ignition turned on.

Checks for a shorted component or a short to battery positive voltage on the output driver circuit. Either condition would result in a measured current of over 0.5 amp.

Checks for a faulty stepper motor cruise control module.

This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming .

Step	Action	Values	Yes	No
1	Was the Powertrain On Board Diagnostic (OBD) System Check performed?	--	Go to Step 2	Go to Powertrain On Board Diagnostic (OBD) System Check
2	Turn the ignition off. Disconnect the PCM. Turn the ignition on. Using DMM (J 39200), measure voltage between the cruise inhibit driver circuit at the PCM harness connector and ground. Is the voltage near the specified value?	B+	Go to Step 3	Go to Step 6
3	Set up DMM to measure 10 amp range. Measure current between the cruise inhibit driver circuit and ground. Monitor the current reading on the DMM for at least 2 minutes. Does the current reading remain less than the specified value?	0.5 amp	Go to Step 11	Go to Step 4
4	Disconnect the SMCC module (leave the PCM disconnected). Using DMM, measure voltage between the cruise inhibit driver circuit and ground. Is voltage at the specified value?	0.0V	Go to Step 14	Go to Step 5
5	Locate and repair short to voltage in the cruise inhibit driver circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	--	Go to Step 16	--
6	Check the ignition feed fuse for the SMCC module. Is the fuse blown?	--	Go to Step 7	Go to Step 8
7	Locate and repair short to ground in ignition feed circuit for the SMCC module. Refer to Wiring Repairs in Wiring Systems. Replace the fuse. Did you complete the repair?	--	Go to Step 16	--
8	Disconnect the SMCC module. Turn the ignition on. Measure the voltage between the ignition feed circuit for the SMCC module and ground. Is the voltage near the specified value?	B+	Go to Step 9	Go to Step 13
9	Check the cruise inhibit driver circuit for an open or a short to ground. If a problem is found, repair the cruise inhibit driver circuit. Was a problem found?	--	Go to Step 16	Go to Step 10
10	Check the cruise inhibit driver circuit and the ignition feed circuit for a faulty connection at the SMCC module and at the PCM. If a problem is found, replace the faulty terminals. Refer to Connector Repairs or Wiring Repairs in Wiring Systems. Was a problem found?	--	Go to Step 16	Go to Step 14
11	Turn the ignition off. Reconnect the PCM and disconnect the SMCC module. Turn the ignition on. Connect a test light between the cruise inhibit driver circuit and the ignition feed circuit at the SMCC module harness connector. Using the scan tool outputs test function, cycle the cruise inhibit output on and off. Does the test light flash on and off?	--	Go to Diagnostic Aids	Go to Step 12
12	Check the cruise inhibit driver circuit for a faulty connection at the PCM. If a problem is found, replace the faulty terminal. Refer to Connector Repairs or Wiring Repairs in Wiring Systems. Was a problem found?	--	Go to Step 16	Go to Step 15
13	Locate and repair open in ignition feed circuit to the SMCC module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	--	Go to Step 16	--
14	Replace the stepper motor cruise control (SMCC) module. Refer to Cruise Control Module Replacement in Cruise Control. Did you complete the repair?	--	Go to Step 16	--
15	Important: : Replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Did you complete the repair?	--	Go to Step 16	--
16	Review and record scan tool Fail Records data. Clear DTCs. Operate vehicle within Fail Records conditions as noted. Using a scan tool, monitor SPECIFIC DTC info for DTC P1662 until the DTC P1662 test runs. Does scan tool indicate DTC P1662 failed this ignition?	--	Go to Step 2	Repair complete