DTC P1652 Cooling Fan Relay 2 Control Circuit. Oldsmobile Intrigue 1999

For 1990-2009 cars only

Makes 🢒 Oldsmobile 🢒 1999 🢒 Intrigue 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 DTC P1652 Cooling Fan Relay 2 Control Circuit

Refer to

Cooling Fans Controls

Cell 10: Underhood Accessory Wiring Junction Block
Cell 14: L36 Engine Ground G117
Cell 14: L36 Engine Ground G117
A/C Compressor Controls
OBD II Symbol Description Notice
Engine Controls Components
Handling ESD Sensitive Parts Notice

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. Unlike the Quad Driver Modules (QDMs) used in prior model years, ODMs have the capability of diagnosing each output circuit individually. DTC P1652 set indicates an improper voltage level has been detected on output circuit which controls the high speed and series/parallel cooling fan relays.

Conditions for Setting the DTC

•	The ignition is ON.

•	An improper voltage level has been detected on the output circuit which controls the Fan 2 relay.

•	The above conditions are present for at least 30 seconds.

Action Taken When the DTC Sets

•	The PCM will illuminate the MIL during the second consecutive trip in which the diagnostic test has been run and failed.

•	The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.

Conditions for Clearing the MIL/DTC

•	The PCM will turn the MIL OFF during the third consecutive trip in which the diagnostic has been run and passed.

•	The 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 or by disconnecting the PCM battery feed.

Diagnostic Aids

Check for the following conditions:

•	Poor connection at the 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, turn the ignition ON and observe a digital multimeter connected between the Fan 2 control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the series/parallel fan relay and the high speed fan relay. A change in voltage will indicate the location of the malfunction.

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

This check ensures that battery positive voltage is present.

This check determines if the high speed fans control circuit is shorted to battery positive voltage.

This check determines if the current draw of the high speed fan relays is within specification.

If the current draw is not within specifications, this check determines which relay is responsible.

This vehicle is equipped with a powertrain control module (PCM) which utilizes an electrically erasable programmable read-only memory (EEPROM). When the PCM is replaced, the new PCM must be programmed.

DTC P1652 - Fan 2 Relay Control Circuit

Step

Action

Value(s)

Yes

Did you perform the Powertrain On-Board Diagnostic System Check?

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

Turn the ignition switch to the OFF position.
Disconnect the PCM.
Turn the ignition switch to the ON position.
Use a digital multimeter (DMM) in order to measure the voltage between the high speed fans control circuit and ground.

Is voltage near the specified value?

B+

Go to Step 3

Go to Step 7

Turn the ignition switch to the OFF position.
Leave the PCM disconnected.
Remove the cool fan 2 and the cool fan 3 relays.
Turn the ignition switch to the ON position.
Use the DMM in order to measure the voltage between the high speed fans control circuit and ground.

Is voltage equal to the specified value?

0 V

Go to Step 4

Go to Step 6

Turn the ignition switch to the OFF position.
Leave the PCM disconnected.
Reinstall the cool fan 2 and cool fan 3 relays.
Set the DMM to measure the 10 amp scale.
Turn the ignition switch to the ON position.
Measure the current between the high speed fans control circuit ground.
Monitor the current reading on the DMM for at least 2 minutes.

Is the current reading within the specified range?

0.05-1.5 amps

Go to Step 13

Go to Step 5

Turn the ignition switch to the OFF position.
Leave the PCM disconnected.
Leave the DMM to measure the 10 amp scale.
Remove the cool fan 2 relay.
Turn the ignition switch to the ON position.
Measure current between the high speed fans control circuit and ground.
Monitor the current reading on the DMM for at least 2 minutes.

Is the current reading within the specified range?

0.05-1.5 amps

Go to Step 15

Go to Step 16

Locate and repair a short to voltage in the high speed fans control circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

Leave the PCM disconnected.
Inspect the battery positive feed fuse for the cool fan 2 and cool fan 3 relays.

Is the fuse open?

Go to Step 8

Go to Step 9

Locate and repair the short to voltage in the battery positive feed circuit to the cool fan 2 and cool fan 3 relays. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

Leave the PCM disconnected.
Turn the ignition switch to the OFF position.
Remove the cool fan 2 and cool fan 3 relays.
Turn the ignition switch to the ON position.
Connect the test lamp to ground
Use the test lamp in order to probe the battery positive feed cavity for the cool fan 2 and cool fan 3 relays.

Does the test lamp illuminate?

Go to Step 10

Go to Step 12

Leave the PCM disocnnected.
Leave the cool fan 2 and cool fan 3 relays disconnected.
Test the high speed fans control circuit for an open or short to ground.
If a problem if found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Was a problem found?

Go to Step 18

Go to Step 11

Leave the PCM disconnected.
Leave the cool fan 2 and cool fan 3 relays disconnected.
Test the high speed fans control circuit for faulty terminal connections at the PCM and the relay connector.
If a problem is found, repair as necessary. Refer to Connector Repairs in Wiring Systems.

Was a problem found?

Go to Step 18

Go to Step 17

Locate and repair the following circuit condition(s):

•	An open in the B+ feed circuit to the cool fan 2 and cool fan 3 relays.

•	Any faulty connections between the B+ feed fuse and the fuse block.

Refer to Wiring Repairs or to Connector Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

Turn the ignition switch to the OFF position.
Remove the cool fan 3 relay.
Reconnect the PCM connector.
Turn the ignition switch to the ON position.
Using the proper jumpers, connect the test lamp between the battery positive feed and the high speed fans control circuit in the cool fan 3 relay.
Using the scan tool Special Function, Outputs, cycle the cool fan 3 relay on and off.

Does the test lamp flash?

Go to Diagnostic Aids

Go to Step 14

Test the high speed fans control circuit for a faulty connection at the PCM.
If a problem is found, repair as necessary. Refer to Connector Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

Replace the cool fan 2 relay.

Did you complete the repair?

Go to Step 18

Replace the cool fan 3 relay.

Did you complete the repair?

Go to Step 18

Important: Replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming

Replace the PCM.

Did you complete the repair?

Go to Step 18