WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

This pinpoint test is intended to diagnose and isolate intermittent concerns for the following:

all electronic engine control (EEC) subsystems
TCM (7B012)

This chart is used to determine which test to run for the suspect circuit. Corresponding parameter identifiers (PIDs) to each circuit are listed. Some circuits do not have an associated PID or the PID may not be available and has to be measured with a digital multimeter (DMM). More specific PIDs can be found in Typical Diagnostic Reference Values.

PCM PIDS AND SIGNALS

PCM PIDS And Signals	Associated Circuit	Test Type
AAT, AAT_V	AAT	input
APP1	APP1	input
APP2	APP2	input
BOO1	BPP	input
BOO2	BPS	input
CHT, CHT_V	CHT	Input
Use DMM	CKP	Input
Use DMM	CMP	Input
Use DMM	COP1	Output
Use DMM	COP2	Output
Use DMM	COP3	Output
Use DMM	COP4	Output
Use DMM	CTO	Output
ECT	ECT	Input
EGRMC1	EGRMC1	Output
EGRMC2	EGRMC2	Output
EGRMC3	EGRMC3	Output
EGRMC4	EGRMC4	Output
EVAPCP	EVAPCP	Output
EVAP LDP CMD	EVAPLDP	Output
EVAP LDP PRS, EVAP LDP PSV	EVAPLDPPR	Input
EVAP SW VLV	EVAPLDPSV	Output
EVBV	FTIV or VBV	Output
FAN DSD	FCV	Output
FP	FPC	Output
FPM	FPM	Input
FTP	FTP	Input
HTRCM12	HTR12	Output
IAT, IAT_V	IAT	Input
Use DMM	INJ1	Output
Use DMM	INJ2	Output
Use DMM	INJ3	Output
Use DMM	INJ4	Output
Use DMM	ISP-R	Input
KEYST	ISP-RS	Input
KS1	KS1	Input
KS2	KS2	Input
MAF, MAF_HZ	MAF	Input
MAP, MAP_GAUGE	MAP	Input
O2S12	HO2S12	Input
Use DMM	TACM (+)	Output
Use DMM	TACM (-)	Output
TP1	TP1	Input
TP2	TP2	Input
HTRCM11	UO2SHTR11	Output
O2S11 CUR	UO2S11	Input
VPWR	VPWR	Input
VREF	VREF	Output

SOBDMC PIDS AND SIGNALS

SOBDMC PIDS And Signals	Associated Circuit	Test Type
BPO	BPO	Input
CTO	CTO	Input
GCLTEMP	GCT	Input
IGN SW	ISP-R	Input
KEYPOS	ISP-RS	Input
MCLTEMP	MCT	Input
MECP	MESCP	Output
TOT	TFT	Input
VPWR	VPWR	Input

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Pinpoint Tests Z: Intermittent: Introduction

Use the Manual With the Right Hardware

When to See a Mechanic

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