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Symptom Testing

On all applications, using REFERENCE VALUE SYMPTOM table can help in selecting PIDs that are related to a specific fault area. See REFERENCE VALUE SYMPTOM  table. Select a symptom from table, note category number and proceed to REFERENCE VALUE SYMPTOM-TO-PID (NGV & GASOLINE)  table. For multiple symptoms, select most evident symptom. Match category number with related PIDs/measured signals (component and signal) and perform PID TESTING .

REFERENCE VALUE SYMPTOM

Symptom Occurs During Category No.
Start-Up
No Start/Normal Crank 1
Hard Start/Long Crank 2
Stalls After Start 3
Diesels/Runs On 4
Idle
MIL 5
Stalls/Quits 6
Slow 7
Slow Return 8
Rolling 9
Fast 10
Rough 11
Misses 12
Backfires 13
Acceleration
Stalls/Quits 6
Misses 12
Bucks/Jerks 14
Backfires 13
Hesitation 15
Lack/Loss Of Power 16
Surge 17
Spark Knock 18
Cooling System Pressure 19
Poor Fuel Economy 20
Emissions Compliance 21
Cruise
Stalls/Quits 6
Misses 12
Bucks/Jerks 14
Backfires 13
Lack/Loss Of Power 16
Surge 17
Spark Knock 18
Cooling System Temperature 19
Poor Fuel Economy 20
Emissions Compliance 21
Deceleration
Stalls/Quits 6
Backfires 13
Automatic Transmission Operation
Shift/Engagement Concerns 22
No Overdrive 23
Manual Transmission Operation
No Reverse Lights 24
REFERENCE VALUE SYMPTOM-TO-PID (NGV & GASOLINE)

Category No. (1) Related PIDs/Measured Signals
5, 9, 10 Or 17 ACCS
5, 10 Or 17 ACP
5, 10 Or 17 ACP V
5 Or 21 AIR
5 Or 21 AIRM
5 GFS
5 GENFDC
23 BPP
22 Or 23 CCS
18 Or 19 CHT
18 Or 19 CHT V
1, 2, 3, 5, 6, 7, 11, 12, 13, 14, 15, 16, 17, 20 Or 21 CKP
1, 2, 3, 5, 6, 7, 11, 12, 13, 14, 15, 16, 17, 20 Or 21 CMP
10 CPP/PNP
3, 5, 6, 7, 9, 11, 15, 16, 20 Or 21 DPFEGR
4, 18, 19, 21 Or 22 ECT
4, 18, 19, 21 Or 22 ECT V
2, 5, 7, 10, 15, 16, 18, 19, 20 Or 21 EFTA
2, 5, 7, 10, 15, 16, 18, 19, 20 Or 21 EFTA V
2, 5, 7, 10, 15, 16, 18, 19, 20 Or 21 EFTB
2, 5, 7, 10, 15, 16, 18, 19, 20 Or 21 EFTB V
3, 5, 6, 7, 9, 11, 15, 16, 20 Or 21 EGRVR
5, 18, 19, 20 Or 21 EOT
5, 18, 19, 20 Or 21 EOT V
22 EPC
22 EPC V
3, 5, 6, 11 Or 21 EVAPCV
3, 5, 6, 11 Or 21 EVAPPDC
5 Or 21 EVAPPF
5 Or 21 FF
20 FLI
20 FLI V
1-21 FP
1-21 FP M
1-21 FPM
1-21 FRP
1-21 FRP V
1-21 FSV-NGV
1-21 FSVM
5 FTP
5 FTP V
1-21 FUELPW1/2
1-21 FUELSYS1/2
22 Or 23 GEAR
19 HFC
1-21 HTR11/12/21/22
1-21 IAC
2, 3, 5, 7, 8, 10 Or 22 IAT
2, 3, 5, 7, 8, 10 Or 22 IAT2
2, 3, 5, 7, 8, 10 Or 22 IAT V
2, 3, 5, 7, 8, 10 Or 22 IAT2 V
5, 14, 15, 16, 17 Or 20 IMRC
5, 14, 15, 16, 17 Or 20 IMRCM
5, 14, 15, 16, 17 Or 20 IMTV
4, 5, 16, 18, 19, 20 Or 21 KS1
4, 5, 16, 18, 19, 20 Or 21 KS2
19 LFC
1-21 LONGFT1/2 (2)
1-23 MAF
1-23 MAF V
1-22 MISF
1-21 O2S11/12/21/22
15, 18, 20 Or 21 OCTADJ
22 OSS
10 PSP
10 PSP V
5 PTO
22 Or 23 PNP
24 REVERSE
1-23 RPM
5, 14, 16 Or 17 SCB SCICP
1-21 SHRTFT1/2/11/12/21/22
15, 16, 18, 19, 20 Or 21 SPRKADV
22 Or 23 SS1/SS2/SS3
22 TCIL
6, 14, 16 Or 20 TCC
22 Or 23 TCS
22 Or 23 TFT
22 Or 23 TFT V
1 Or 23 TP
1 Or 23 TP V
22 Or 23 TR
22, 23 Or 24 TR D
22 Or 23 TR V
22 Or 23 TSS
2, 4, 5, 9, 10, 11, 16, 17, 18, 19, 20 Or 21 VCT
1, 2, 3, 5, 6, 11, 12, 13 Or 14 VPWR
22 Or 23 VSS
5, 9, 10 Or 17 WAC
(1) Some vehicles may not display all input and output signals.
(2) Generic PID.
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