Scan Tool Testing and Procedures

Diagnostic Chart:

IPC Data Displays:

ID40 The FUEL LEVEL is read from the fuel sender unit in gallons between 0.0 and 24.7.

ID42 The DIMMING POT PWM is read as a PWM between 0 and 100%. Typical range of 24 (max dim) to 95 (full bright). ID42 only updates while parklamps or headlamps are 'On'.

ID50 The BATTERY VOLTS is read in volts between 0.0 and 18.0, at pin C13 - Ignition 1.

ID60 The VEHICLE SPEED is read in miles per hour between 0 and 255.

ID80 The LOW BRAKE FLUID signal is read in volts between 0 and 5 volts.

ID89 The OPTION 0 is the decimal equivalent of an 8 bit binary code specifying vehicle option content. Refer to IS07 for complete option details.

ID90 The OPTION 1 is the decimal equivalent of an 8 bit binary code specifying vehicle option content. The value is set between 0 and 255. Refer to IS08 for complete option details.

ID91 The OPTION 2 is the decimal equivalent of an 8 bit binary code specifying vehicle option content. The value is set between 0 and 255. Refer to IS09 for complete details.

ID97 The IGNITION CYCLE COUNTER value is the number of times that the IPC has been turned 'off' since a IPC trouble code was last detected. After 100 ignition cycles without any malfunction being detected, all IPC codes are cleared.

ID98 The IDC SOFTWARE VERSION is software ID for one of the IPC microprocessors.

ID99 The VSM SOFTWARE VERSION is software ID for the second IPC microprocessors.

IPC Input Displays:

II07 The TRUNK SWITCH display reads 'HI' with the trunk closed.

II09 The WASHER FLUID LEVEL SWITCH display is 'LO' when the vehicle is low on washer fluid.

II10 The GENERATOR FEEDBACK display is 'LO' when there is a GENERATOR problem or engine not running.

II11 The METAL TEMPERATURE switch input reads 'LO' when the metal temp switch is closed (hot engine condition).

II12 The RIDE CONTROL FAULT display reads the state of the CCR input. Normal operation is 'LO' below 5 MPH and 'HI' above 15 MPH.

II65 OIL PRESSURE SWITCH will indicate 'HI' with proper oil pressure.

II67 The PARK Input is used to display the Apply Brake To Shift' from PARK for Northstar Engine.

II90 LEFT TURN SWITCH will indicate 'LO' with left turn signal not selected, and toggle 'LO/HI' while directional is active.

II91 RIGHT TURN SWITCH will indicate 'LO' with right turn signal not selected, and toggle 'LO/HI' while directional is active.

II93 HIGH BEAM SWITCH will indicate 'HI' with high beams ON

II94 PARKLAMP INPUT will read 'HI' with parklamps, low beams, or high beams ON.

IPC Override Displays:

IS00 This test will display 'none' as no overrides are active at this point.

IS07 The OPTION 0 override allows the ability to suppress the 'LOW ENGINE OIL message and to display 'Option Not Set' message.

Option Not Set 6
Suppress Low Engine Oil 128
Normal US Vehicle IS07 = 00

IS08 The 'OPTION 1' override allows the ability to change the vehicle option content information stored in the IPC. The IPC uses this option information to determine how to operate the displays and other electronic devices. Incorrect option content information in the IPC may cause many different problems. Upon selection of this override the option content information will be displayed as a number. To determine the proper OPTION 1 number, calculate the sum of the applicable numbers from the following table:

IF VEHICLE IS EQUIPPED WITH ADD

French/Canadian Displays (Canadian Only) 128
*European Economic Community (EEC) 64
*Japanese Displays 32
*Saudi Arabia 16
Ride Control 8
*Disable Premium Fuel Display (NM8, MAJ) 2
**Suppress Low Fuel Warning 1

*Export only - Not for North American Vehicles
** Options not currently used

Normal North American (4.9L) vehicles 1S08 value is 0.
Normal North American (4.6L) vehicles 1S08 value is 8.

If necessary, the 'WARMER' and 'COOLER' buttons can be used to increase and decrease the OPTION 1 number. When the correct number is reached, simultaneously press and hold the 'ECON' and 'FRONT DEFROST' buttons for three seconds to permanently store the correct value in the EEPROM. The display will blank momentarily and then display the newly stored number.

IS09 The 'OPTION 2' override allows the ability to change the vehicle option content information stored in the IPC. The IPC uses this option information to determine how to operate the displays and other electronic devices. Incorrect option content information in the IPC may cause many different problems. Upon selection of this override the option content information will be displayed as a number. To determine the proper OPTION 2 number, calculate the sum of the applicable numbers from the following table:

IF VEHICLE IS EQUIPPED WITH ADD

Heated Windshield (C50) 128
Traction Control (L37 or LD8) 64
Analog Cluster Mode (VY9) 32
Digital Cluster Mode 0
Fuel Tank (all cars) 16
Brake Fluid Sensor (N*) 4
Suppress Coolant Level Message (4.9L) 2
Suppress 'Apply Brake To Shift' (all cars) 1

Normal North American vehicles, IS09 value

4.6L With Heated Windshield = 245
4.6L Without Heated Windshield = 117
4.9L ANALOG IPC With Heated Windshield = 179
4.9L ANALOG IPC Without Heated Windshield = 51
4.9L DIGITAL IPC With Heated Windshield = 147
4.9L DIGITAL IPC Without Heated Windshield = 19

If necessary, the 'WARMER' and 'COOLER' buttons can be used to increase and decrease the OPTION 1 number. When the correct number is reached, simultaneously press and hold the 'ECON' and 'FRONT DEFROST' buttons for three seconds to permanently store the correct value in the EEPROM. The display will blank momentarily and then display the newly stored number.

IS10 SET TEMP OFFSET is used to allow the Set Temperature to be different from the commanded Set Temperature from -5°F to +5°F Example: If customer complaint that it is too warm, you should go negative and vice a versa.

IS45 The VACUUM FLUORESCENT DIMMING override will control IPC and Radio VF displays from '0' (Max dim) to '99' (Max bright). The display will hold the override value upon release of the buttons.