DTC P0322 IC Module 4X Reference CKT No Frequency. Cadillac Seville 1998

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 1998 🢒 Seville 🢒 Engine 🢒 Engine Controls - 4.0L and 4.6L 🢒 DTC P0322 IC Module 4X Reference CKT No Frequency

Engine Controls Components
Cell 20: Ignition Control (IC) Module
OBD II Symbol Description Notice
ESD Notice
ESD Notice

Circuit Description

The PCM checks for CAM pulses being received without 4X reference pulses.

Conditions for Running the DTC

•	DTCs P0340 and P1376 not set.

•	A CAM sensor signal has been received in the last 4 seconds.

Conditions for Setting the DTC

No 4X reference pulses received for 4 seconds.

Action Taken When the DTC Sets

PCM uses 24X signal for ignition and fuel control.

•	The PCM will illuminate the malfunction indicator lamp (MIL) when the diagnostic runs and fails.

•	The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records.

Conditions for Clearing the Message/DTC

•	The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.

•	A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.

•	A History DTC will clear after forty consecutive warm-up cycles with no failures of any emission related diagnostic test.

•	Use a scan tool to clear DTCs.

•	Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Clearing Diagnostic Trouble Codes in PCM Description and Operation.

Without 4X reference pulses the vehicle will start although crank time can be extended to as much as 45 seconds. If this DTC is set with a No Start complaint crank the vehicle for 45 seconds before attempting to determine the cause of a No Start condition.

Test Description

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

Check to see if DTC P1376 is set because a REF LO problem can cause other ignition problems.

If DTC P0322 is current, the condition still exists and can be diagnosed directly. If DTC P0322 is history, look at snapshot data to determine conditions under which DTC was set.

Check for proper output of the Electronic Ignition System. If the voltmeter reads 4.1 volts or greater, the Ignition Control Module is able to produce 4X reference pulses.

Checking for 4X reference pulses on Fuel Control circuit from the Ignition Control Module to the PCM. If the frequency is between 30 and 100 Hertz, the PCM is receiving 4X reference pulses.

Checking to see if the DTC P0322 was set while the vehicle was running or not, if MAP value is 80 kPa or less vehicle was running at DTC set. Stray CAM pulses at key ON engine not running can cause DTC P0322 to set falsely.

Step

Action

Value(s)

Yes

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

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

Connect a scan tool.

Is DTC P1376 set also?

Go to DTC P1376 Ignition Ground Circuit

Go to Step 3

Start and idle engine.
Select Fail This Ign.

Is DTC P0322 current?

Go to Step 4

Go to Step 9

Record the fluid life indexes, turn the key to LOCK and wait 30 seconds.
Disconnect PCM connector C2.
Disconnect Ignition Control module connector C4.
Using DMM J 39200 measure the resistance to ground at IC module connector terminal C (harness side).

Is the resistance the value specified?

Go to Step 5

Go to Step 12

Measure the resistance between PCM connector C2 terminal 44 and IC module connector C4 terminal C.

Is the resistance the same or less than the value specified?

5 ohms

Go to Step 6

Go to Step 13

Turn the key ON.
Measure the voltage to ground at IC module connector C4 terminal C.

Is the voltage the same or less than the value specified?

0.5 volts

Go to Step 7

Go to Step 14

Reconnect IC module connector C4.
Measure the voltage to ground at PCM connector C2 terminal 44.

Is the voltage the same or more than the value specified?

4.1 volts

Go to Step 8

Go to Step 15

Remove teminal 44 from PCM connector C2.
Reconnect PCM connector C2.
Set the DMM to 400 mV A/C scale and push the Hz button.
Connect the DMM to terminal 44 and ground.
Start the engine and measure the FREQUENCY on terminal 44.

Is the frequency measured between the range specified?

30 to 100 Hertz

Go to Step 16

Go to Step 15

Check the Failure Rec. for DTC P0322 and check the MAP sensor value when the DTC was set.

Was the MAP sensor value greater than the value specified?

80 kPa

Go to Step 10

Go to Step 11

Check for intermittent short to voltage or EMI (electromagnetic interference) on cam sensor wires.
Possible causes are:

•	Wiring run along side spark plug wires.

•	High power transmitters (like mobile radios) operating in the vicinity.

•	A battery charger may also set the DTC.

Was a possible cause located and corrected?

Go to Powertrain Control Module Diagnosis for Verify Repair

Fault not present

Check for intermittent opens or shorts on the Fuel Control circuit and at PCM terminal C2-44 and at Ignition Control Module connector C4 terminal C. Check for an intermittent open in the Ignition Control Module ignition feed circuit.

Was a possible cause located and corrected?

Go to Powertrain Control Module Diagnosis for Verify Repair

Fault not present

Repair short to ground on the Fuel Control circuit.

Is the repair complete?

Go to Powertrain Control Module Diagnosis for Verify Repair

Repair the open on the Fuel Control circuit.

Is the repair complete?

Go to Powertrain Control Module Diagnosis for Verify Repair

Repair the short to voltage on the Fuel Control circuit.

Is the repair complete?

Go to Powertrain Control Module Diagnosis for Verify Repair