Reference Value Parameter Identification (PID)/Measured Signal Chart

NOTE: The following listing reflects PIDS and/or measured values which may reveal a possible concern within each system shown. Match the category number with the related PID/measured signal and go to the Typical Diagnostic Reference Value Charts.

Category Number

Related PIDS/Measured Signals

5, 10, 17

ACP

1, 23

APP1

1, 23

APP2

BOO1/BOO2

18, 19

CHT

1, 2, 3, 5, 6, 7, 11, 12, 13, 14, 15, 16, 17, 20, 21

CKP

1, 2, 3, 5, 6, 7, 11, 12, 13, 14, 15, 16, 17, 20, 21

CMP

CPP/PNP

3, 5, 6, 7, 9, 11, 15, 16, 20, 21

DPFEGR

4, 18, 19, 21, 22

ECT

3, 5, 6, 7, 9, 11, 15, 16, 20, 21

EGRMC1 through 4

3, 5, 6, 7, 9, 11, 15, 16, 20, 21

EGRMDSD

3, 5, 6, 7, 9, 11, 15, 16, 20, 21

EGRVR

5, 18, 19, 20, 21

EOT

3, 5, 6, 11, 21

EVAPCV

3, 5, 6, 11, 21

EVMV

FLI

1 through 21

FPM

1 through 21

FRP

1 through 21

FRT

FTP

1 through 21

FUELPW1/2

1 through 21

FUELSYS (OL/CLSD-LP)

HFC

1 through 21

HTR11/12/21/22

2, 3, 5, 7, 8, 10, 22

IAT

2, 3, 5, 7, 8, 10, 22

IAT2

5, 14, 15, 16, 17, 20

IMTV

4, 5, 16, 18, 19, 20, 21

LFC

1 through 21

LONGFT1/2

1 through 23

MAF

1 through 23

MAP

1 through 22

MISF

1 through 21

O2S11/12/21/22

OSS

PSP

PTO

1 through 23

RPM

5, 14, 16, 17

SCICP

1 through 21

SHRTFT1/2/11/12/21/22

15, 16, 18, 19, 20, 21

SPARKADV⁽¹⁾

1, 23

2, 4, 5, 9, 10, 11, 16, 17, 18, 19, 20, 21

VCT

2, 4, 5, 9, 10, 11, 16, 17, 18, 19, 20, 21

VCTDC/VCTDC2

1, 2, 3, 5, 6, 11, 12, 13, 14

VPWR

22, 23

VSS

⁽¹⁾	Value is not useful under this condition.

⁽²⁾	Value depends on fuel tank level. Typical operating range is 15% (empty) to 90% (full).

⁽³⁾	Heated oxygen sensors (HO2S) should switch from rich to lean at least once every 3 seconds. HO2S voltage should toggle above and below 0.450 DCV and never be a negative value. Valid HO2S switching occurs only during closed loop fuel control operation.

⁽⁴⁾

Downstream oxygen sensors stay close to a constant voltage when the catalyst monitor is off (positive value only). When the catalyst monitor is on, the HO2S switches from rich to lean above and below 0.450 DCV and should never be a negative value. For downstream oxygen sensors (12, 22) greater activity results when the catalyst monitor is active.

⁽⁵⁾	The normal operation value is from -1.5 to 3.5 degrees.

NOTE: Footnotes are referenced throughout the Typical Diagnostic Reference Value Charts. A letter in parentheses next to a value indicates supplemental information is available.

An attempt is made to provide as much information as possible. Some vehicles may not display all input and output signals.

The Typical Diagnostic Reference Value Charts do not display fault parameter identifications (PIDs). These are PIDs which indicate a hard fault with the circuit. They display a value of FAULT or NO FAULT and are PIDs ending with the letter F.

Reference values may vary 20% depending on operating conditions, altitude, and other factors. The RPM values are axle and tire dependent.

Values are taken at an altitude of approximately 189 meters (620 ft) above sea level with the engine at normal operating temperature and accessories off.

For detailed transmission diagnostics, refer to the Service Information. Transmission signals may be referred to in either alpha or numeric form. For example, 1=A, 2=B, 3=C.