DTC P1663 Charging System Lamp Control Circuit. Oldsmobile Cutlass Supreme 1997

For 1990-2009 cars only

Makes 🢒 Oldsmobile 🢒 1997 🢒 Cutlass Supreme 🢒 DTC 🢒 DTC P1663 Charging System Lamp Control Circuit

Engine Controls Components 97
Fuel Injectors
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The PCM turns ON the bulb, LED, or driver info center indicator by supplying a path to ground through the PCM.

Conditions for Running the DTC

Ignition is ON.

Conditions for Setting the DTC

•	An improper voltage level has been detected on the cruise inhibit output driver circuit.

•	Above conditions 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 Fail 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.

•	DTC can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed.

A PCM controlled lamp ON at all times most likely indicates that a condition is present which requires the attention of the vehicle operator. Conditions which will illuminate each lamp are as follows:

•	The PCM commands the Generator Lamp ON when the engine speed is greater than 1200 RPM and system voltage falls below 10 volts for longer than 10 seconds. The PCM commands the generator OFF when system voltage rises to above 12 volts.

•	The PCM commands the Generator Lamp ON when the generator control circuit (L terminal) remains low for longer than 10 seconds.

Check for the following conditions:

•	Poor connection at PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.

•

Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM and turn the ignition ON. Observe a voltmeter connected to the affected PCM output circuit while moving connectors and wiring harnesses related to the PCM output circuit. A change in voltage will indicate the location of the fault.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

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

Checks for a shorted component or a short to B+ on the output driver circuit. Either condition would result in a measured current of over 1.5 amps. Also checks for a component that is going open while being operated, resulting in a measured current of 0 amps.

Checks for a faulty instrument cluster.

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.

Step	Action	Value(s)	Yes	No
1	Was the Powertrain On-Board Diagnostic System Check performed?	--	Go to Step 2	Go to the Powertrain On Board Diagnostic (OBD) System Check
2	Was the instrument cluster system check in Engine Electrical performed?	--	Go to Step 3	Refer to Instrument Cluster System Check in Electrical Diagnosis
3	Ignition OFF, disconnect the PCM. Ignition ON. Using J 39200 digital multimeter (DVM), measure voltage between the affected PCM output circuit at the PCM harness connector and ground. Is voltage near the specified value?	B+	Go to Step 4	Go to Step 7
4	DVM to 10 amp scale, install DVM to measure current between the affected PCM output circuit and ground. Monitor the current reading on the DVM for at least 2 minutes. Does the current reading remain between the specified values?	0.05 Amp-1.5 Amps	Go to Step 12	Go to Step 5
5	Disconnect the instrument panel cluster (leave the PCM disconnected). Using DVM, measure voltage between the affected PCM output circuit and ground. Is voltage at the specified value?	0V	Go to Step 15	Go to Step 6
6	Locate and repair short to voltage in affected PCM output circuit. Is action complete?	--	Go to Step 3	--
7	Check the ignition feed fuse for the instrument panel cluster indicator lamps. Is the fuse blown?	--	Go to Step 8	Go to Step 9
8	Locate and repair short to ground in ignition feed circuit for the instrument panel cluster indicator lamps. Refer to Fuse Block Details in Engine Electrical. Replace fuse. Is action complete?	--	Go to Step 3	--
9	Disconnect the instrument panel cluster. Ignition ON, measure voltage between the ignition feed circuit for the instrument panel cluster indicator lamps and ground. Is voltage near the specified value?	B+	Go to Step 10	Go to Step 14
10	Check the affected PCM output circuit for an open or a short to ground. If a problem is found, repair the affected PCM output circuit. Refer to Repair Procedures in Electrical Diagnosis.. Was a problem found?	--	Go to Step 3	Go to Step 11
11	Check the affected PCM output circuit and the ignition feed circuit for a poor connection at the instrument panel cluster and at the PCM. If a problem is found, replace faulty terminal(s). Refer to Repair Procedures in Electrical Diagnosis. Was a problem found?	--	Go to Step 3	Go to Step 15
12	Ignition OFF, reconnect the PCM and disconnect the instrument panel cluster. Ignition ON, connect a test light between the affected PCM output circuit and the ignition feed circuit at the instrument panel cluster harness connector. Using the scan tool outputs test function, cycle the affected lamp ON and OFF. Does the test light flash ON and OFF?	--	Refer to Diagnostic Aids	Go to Step 13
13	Check the affected PCM output circuit for a poor connection at the PCM. If a problem is found, replace faulty terminal. Refer to Repair Procedures in Electrical Diagnosis. Was a problem found?	--	Go to Step 3	Go to Step 16
14	Locate and repair open in ignition feed circuit to the instrument panel cluster indicator lamps. Refer to Repair Procedures in Electrical Diagnosis. Is action complete?	--	Go to Step 3	--
15	Replace the instrument panel cluster. Is action complete?	--	Go to Step 3	--
16	Replace the PCM. Important: Replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . Is action complete?	--	Go to Step 3	--
17	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 P1663 until the DTC P1663 test runs. Note test result;; does scan tool indicate DTC P1663 failed this ign?	--	Go to Step 3	Repair complete