REFERENCE VALUE SYMPTOM CHART
The Reference Value Symptom Chart provides guidance in selecting the appropriate parameter identification (PID) or measured signal related to the fault area. Select a symptom from the symptom chart along with the category number and go to the PID/Measured Signal Chart. For multiple symptoms, select the symptom that is most evident.
Symptom Chart
| Symptom occurs during | Symptom | Category Number |
| STARTUP | No Start/Vehicle Disabled | 0 |
| No Start/Normal Crank | 1 |
| IDLE | MIL | 5 |
| Stalls/Quits | 6 |
| Rolling | 9 |
| Rough | 11 |
| Misses | 12 |
| Backfires | 13 |
| ACCELERATION | Stalls/Quits | 6 |
| Misses | 12 |
| Bucks/Jerks | 14 |
| Backfires | 13 |
| Hesitation/Stumble | 15 |
| Lack/Loss Of Power | 16 |
| Surge | 17 |
| Spark Knock | 18 |
| Cooling System Temperature | 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 |
| TRANSMISSION OPERATION: (AUTOMATIC) | Engagement Concerns | 22 |
TYPICAL DIAGNOSTIC REFERENCE VALUES
Note. The footnotes are referenced throughout the Typical Diagnostic Reference Value Charts. A letter in parentheses next to a value indicates supplemental information is applicable. 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 YES or NO and are PIDs ending with an F. The Typical Diagnostic Reference Value Charts do not display limited operating strategy (LOS) PIDs. These are PIDs which indicate what LOS mode that vehicle is in. They display a value of YES or NO. 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 the downstream heated exhaust gas oxygen sensor (HO2S12), greater activity results when the catalyst monitor is active. Refer to the ACRONYMS AND DEFINITIONS for technical terms applicable to Ford Motor Company products. Refer to PARAMETER IDENTIFICATION (PID) , for PID descriptions. 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. 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. Value is not useful under this condition.
Scheme 51
| Sensors/Inputs | PCM Pin/PID Only | Measured/PID Values | Units Measured/PID |
| KOEO | Hot Idle | 48 KM/H (30 MPH) | 89 KM/H (55 MPH) |
| BOO1 | B2 | OFF | OFF | OFF | OFF | ON/OFF |
| BOO2 | B3 | OFF | OFF | OFF | OFF | ON/OFF |
| FPM | B4 | 39.60 | 38.63 | 39.60 | 39.54 | % |
| KEYST | B9 | ON | ON | ON | ON | ON/OFF |
| B+ | B10 | 12.91 | 13.52 | 13.49 | 13.57 | VOLTS |
| FTP | B26 | 2.61/0 (0) | 2.32/-0.48 (- 0.07) | 2.22/-0.69 (- 0.10) | 2.13/-0.83 (- 0.12) | VOLTS/kPa (PSI) |
| APP2 | B29 | 0.38 | 0.38 | 0.66 | 0.60 | VOLTS |
| APP1 | B30 | 0.76 | 0.76 | 1.32 | 1.18 | VOLTS |
| EVAP_LDP_ PRS | B31 | 0 (0) | 0.41 (-0.06) | 0.76 (-0.11) | 0.97 (-0.14) | KPa (PSI) |
| EVAP_LDP_ PSV | B31 | 3.60 | 3.61 | 3.60 | 3.59 | VOLTS |
| AAT | B33 | 29 (84.20) | 28 (82.40) | 23 (73.40) | 23 (73.40 | DEG C (DEG F) |
| AAT_V | B33 | 0.98 | 1.01 | 1.16 | 1.16 | VOLTS |
| O2S11_CUR | E8 | (C) | Switching (A) | Switching (A) | Switching (A) | UA |
| MAF | E13 | 2.17 | 2.90 | 13.31 | 7.25 | G/s |
| MAF_HZ | E13 | 0.71 | 2.27 | 4.09 | 2.87 | KHz |
| CHT | E15 | 3.27/98 (208.40) | 3.31/96 (204.80) | 3.47/92 (197.60) | 3.53/91 (195.80) | VOLTS/DEG C (DEG F) |
| TP2 | E16 | 1.25/24.70 | 0.85/16.86 | 0.72/14.11 | 2.25/44.70 | VOLTS/% |
| IAT | E17 | 1.01/61 (141.80) | 1.25/53 (127.40) | 2.05/31 (87.80) | 2.07/31 (87.80) | VOLTS/DEG C (DEG F) |
| MAP | E18 | 4.06/99.97 (14.50) | 1.49/35.99 (5.22) | 3.44/84.94 (12.32) | 2.53/61.98 (8.99) | VOLTS/kPa (PSI) |
| MAP_GAUGE | E18 | 4.01 | 260.95 | 40.14 | 32.11 | In-H 2 O |
| O2S12 | E21 | (C) | (B) | (B) | (B) | VOLTS |
| TP1 | E27 | 4.07/18.43 | 4.27/14.51 | 4.33/12.94 | 3.56/28.23 | VOLTS/% |
| HTRCM12 | E35 | 0 | 742 | 697 | 697 | MA |
| HTRCM11 | E47 | 0 | 1.47 | 1.46 | 1.46 | MA |
| KNOCK_1 | T17 | 0 | 56 | 0 | 97 | N/A |
| KNOCK_2 | T20 | 0 | 60 | 0 | 126 | N/A |
| AC_REQ | PID | NO | NO | NO | NO | YES/NO |
| APP | PID | 0 | 0 | 18 | 13.50 | % |
| APP_ MAXDIFF | PID | 0 | 0 | 0 | 0 | DEG |
| APP_MODE | PID | NO PEDAL | NO PEDAL | NO PEDAL | PART PEDAL | NO PEDAL/PART PEDAL |
| APP1 (APP_D) | PID | 14.90 | 14.90 | 26.27 | 23.52 | % |
| APP2 (APP_E) | PID | 7.45 | 7.45 | 13.33 | 11.76 | % |
| BARO | PID | 99.97 (14.50)/ 157.02/ 401.46 | 99.97 (14.50)/ 157.02/ 401.46 | 99.97 (14.50)/ 157.02/ 401.46 | 99.97 (14.50)/ 157.02/ 401.46 | KPa (PSI)/Hz/ in-H 2 O |
| BRKOVR_ACTION | PID | 0 | 0 | 0 | 0 | NUMERIC VALUE |
| BRKOVRD_POSS | PID | 0 | 0 | 0 | 0 | NUMERIC VALUE |
| DECHOKE | PID | YES | NO | NO | NO | YES/NO |
| DIST_BRKOVRD | PID | 0 | 0 | 0 | 0 | KM (MILES) |
| EQ_RAT11 | PID | 0/0:1 | 1/14.73:1 | 1.06/ 15.53:1 | 0.94/ 13.75:1 | RATIO |
| ETC_ACT | PID | 8 | 2.75 | 11.19 | 3.41 | DEG |
| ETC_TRIM | PID | 0.42 | 0.42 | 0.42 | 0.42 | DEG |
| FLI | PID | 32.94 | 34.11 | 30.98 | 30.98 | % |
| INJPWR_M | PID | 12.91 | 13.49 | 13.52 | 13.54 | VOLTS |
| LOAD | PID | 0 | 30.98 | 79.21 | 49.41 | % |
| MISFIRE | PID | NO | NO | NO | NO | YES/NO |
| MP_LRN | PID | YES | YES | YES | YES | YES/NO |
| NUM_MISFIRE | PID | 0 | 1 | 2 | 2 | COUNT |
| O2S11_IMPED | PID | 4.15 | 0.98 | 0.98 | 0.98 | VOLTS |
| O2S11_READY | PID | NO | YES | YES | NO | YES/NO |
| O2S11_TR | PID | 0 | 0 | 0 | 0 | Kohm |
| OCTADJ_R_LRND | PID | 15.21 | 15.21 | 15.21 | 15.21 | % |
| RPM | PID | 0 | 1163.25 | 1441.50 | 1396.50 | RPM |
| SYNC | PID | YES | YES | YES | YES | YES/NO |
| TPMODE | PID | WOT | PT | CT | PT | CLOSED/ PART/WIDE OPEN THROTTLE |
| VCTSYS | PID | OPEN LOOP | CLOSED LOOP | OPEN LOOP | CLOSED LOOP | OPEN LOOP/ CLOSED LOOP |
| VSS | PID | 0 | 0 | 48 km/h (30 MPH) | 89 km/h (55 MPH) | Km/h/MPH |
TYPICAL DIAGNOSTIC REFERENCE VALUES
| Actuators/Outputs | PCM Pin/PID Only | Measured/PID Values | Units Measured/PID |
| KOEO | Hot Idle | 48 KM/H (30 MPH) | 89 KM/H (55 MPH) |
| EVAP_LDP_CMD | B23 | OFF | OFF | OFF | OFF | ON/OFF |
| FP | B37 | 75/OFF | 43.76/ON | 75/OFF | 44.33/ON | %/ON/OFF |
| EVBV | E24 | 0/OFF | 0/OFF | 100/ON | 100/ON | %/ON/OFF/VARYING |
| EVAP_SW_VLV | E29 | 0 | 0 | 0 | 0 | % |
| HTR12 | E35 | OFF | ON | ON | ON | ON/OFF |
| VCTDC | E43 | 0 | 0 | 0 | 0 | % |
| HTR11 | E47 | OFF | ON | ON | ON | ON/OFF |
| O2S11_HTR | E47 | 22.74 | 41.96 | 36.86 | 33.33 | % |
| EGR_STEP | PID | 0 | 2 | 0 | 11 | POSITION |
| EGRPCT | PID | 0 | 3.52 | 0 | 30.58 | % |
| ETC [TAC_PCT] | PID | 9.41 | 3.13 | 9.41 | 5.49 | % |
| EVAP020C | PID | NO | NO | NO | NO | YES/NO |
| EVAPSTA | PID | NOT RUNNING | NOT RUNNING | NOT RUNNING | NOT RUNNING | STATUS |
| FAN_DSD | PID | 26.78 | 8.17 | 7.99 | 7.99 | % |
| FANDC | PID | 26.66 | 7.84 | 7.84 | 7.84 | % |
| FUELSYS | PID | OPEN LOOP | CLOSED LOOP | OPEN LOOP | CLOSED LOOP | OPEN/ CLOSED LOOP |
| GRILL_A_CMD | PID | 82.74/ VARYING | 54.51/ VARYING | 7.45/ CLOSED | 0/CLOSED | %/OPEN/ CLOSED |
| GRILL_A_INF | PID | 81.56 | 62.74 | 18.82 | 0 | % |
| GRILL_CMDCAL | PID | NO | NO | NO | NO | YES/NO |
| LONGFT1 | PID | (C) | 20 TO +20 | 20 TO +20 | 20 TO +20 | % |
| MIL | PID | OFF | OFF | OFF | OFF | ON/OFF |
| O2_DS_DISBL | PID | YES | NO | YES | YES | YES/NO |
| RO2FT1 | PID | 0 | 1.09 | 0 | 0 | % |
| SHRTFT1 | PID | (C) | 10 TO +10 | 10 TO +10 | 10 TO +10 | % |
| SPARKADV | PID | 10 | 23.25 | 10 | 30.25 | DEG |
| VCTADV | PID | 0 | 0 | 0 | 35.31 | DEG |
| VCTADVERR | PID | 0 | 0 | 0 | 0.31 | DEG |
| Other | PCM Pin/PID Only | Measured/PID Values | Units Measured/PID |
| KOEO | Hot Idle | 48 KM/H (30 MPH) | 89 KM/H (55 MPH) |
| VREF | B14/B16/ E30/T13 | 5 | 5 | 5 | 5 | VOLTS |
| VPWR | B11/B12 | VBAT | VBAT | VBAT | VBAT | VOLTS |
Scheme 52
Scheme 53
| SOBDMC Inputs | SOBDMC Pin/PID Only | Measured/PID Values | Units Measured/PID |
| Ignition On Engine Off | Hot Idle | 48 KM/H (30 MPH) | 89 KM/H (55 MPH) |
| CTO | A4 | 0 | 1163 | 0 | 1416 | RPM |
| IGN_SW | A29 | YES | YES | YES | YES | YES/NO |
| BPO | B3 | NO | NO | NO | NO | YES/NO |
| TOT | B10 | 46 (114.80) | 36 (96.80) | 48 (118.40) | 50 (122) | DEG C (DEG F) |
| GCLTEMP | B16 | 48 (118.40) | 42 (107.60) | 47 (116.60) | 53 (127.40) | DEG C (DEG F) |
| MCLTEMP | B22 | 39 (102.20) | 31 (87.80) | 48 (118.40) | 53 (127.40) | DEG C (DEG F) |
| APP | PID | 0 | 0 | 9.50 | 6.50 | % |
| ENG_TQ | PID | 0 | 8.30 | 1.20 | 55.50 | Nm |
| ENGLOAD | PID | 0 | 32.94 | 0 | 51.76 | % |
| G_INV_V | PID | 285.90 | 290.40 | 284.20 | 287.80 | VOLTS |
| G_PHTMP | PID | 47 (116.60) | 40 (104) | 50 (122) | 55 (131) | DEG C (DEG F) |
| G_SPEED | PID | 0 | 4111 | 3617 | 6213 | RPM |
| GTQ_OUT | PID | 0 | 3 | 6.70 | 9 | Nm |
| HV_AMP | PID | 1300 | 260 | 700 | 20.96 | MA |
| HVBAT_V | PID | 285 | 288.50 | 282 | 285 | VOLTS |
| I_SDN | PID | NO RAPID SHUTDOWN | NO RAPID SHUTDOWN | NO RAPID SHUTDOWN | NO RAPID SHUTDOWN | MODE |
| IGN_STRT/ RUN | PID | NO | NO | NO | NO | YES/NO |
| M_INV_V | PID | 285.90 | 290.30 | 281 | 268.30 | VOLTS |
| M_PHTMP | PID | 45 (113) | 37 (98.60) | 47 (116.60) | 52 (125.60) | DEG C (DEG F) |
| M_SPEED | PID | 0 | 0 | 3678 | 6380 | RPM |
| OUTDR_TMP | PID | 24 (75.20) | 24 (75.20) | 24 (75.20) | 24 (75.20) | DEG C (DEG F) |
| PRNDL_T | PID | P | P | D | D | POSITION |
| TQ_DSD | PID | 0 | 0 | 14 | 68 | Nm |
| VEHMODE | PID | POWERUP | DRIVING | DRIVING | DRIVING | MODE |
| VSS | PID | 0 | 0 | 48 km/h (30 MPH) | 89 km/h (55 MPH) | Km/h/MPH |
| SOBDMC Outputs | SOBDMC Pin/PID Only | Measured/PID Values | Units Measured/PID |
| Ignition On Engine Off | Hot Idle | 48 KM/H (30 MPH) | 89 KM/H (55 MPH) |
| MECP | A36 | OFF | OFF | ON | ON | ON/OFF |
| MTQ_OUT | B4 | 0 | 1.60 | 1.50 | 24.20 | Nm |
| GENMODE | PID | TORQUE | SPEED | ENGINE STOP | ENGINE STOP | MODE |
| GTQ_CMD | PID | 0 | 1.40 | 8.70 | 2.50 | Nm |
| MTQ_CMD | PID | 0 | 1.60 | 2.10 | 11.40 | Nm |
| POWRPCK_STATE | PID | POWER PACK NOT AVAILABLE | NON MOVING RUN | POWER PACK AVAILABLE | POWER PACK AVAILABLE | MODE |
| Other | SOBDMC Pin/PID Only | Measured/PID Values | Units Measured/PID |
| Ignition On Engine Off | Hot Idle | 48 KM/H (30 MPH) | 89 KM/H (55 MPH) |
| MAINPCM_V | A6 | 13 | 13.75 | 13.75 | 13.75 | VOLTS |
| VPWR_TCM | A9/A10 | 12.42 | 13.02 | 13.04 | 13.06 | VOLTS |
| BECM Outputs | PID Only | PID Values | PID |
| Ignition On Engine Off | Hot Idle | 48 KM/H (30 MPH) | 89 KM/H (55 MPH) |
| BATT_CHAR | PID | 59.46 | 64.63 | 46.15 | 42.54 | % |
| BAT_PACK VOLT | PID | 285.68 | 288.47 | 272.74 | 281.43 | VOLTS |
| H_BATT_TEMP | PID | 26 (78.80) | 25 (77) | 31 (87.80) | 29 (84.20) | DEG C (DEG F) |