Terminals Of ECM
- CHECK ECM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:
The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.
Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition A38-1 (BATT) - C53-81 (E1) L - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V C53-41 (+BM) - C53-81 (E1) P - W-B Power source of throttle actuator Always 11 to 14 V A38-28 (IGSW) - C53-81 (E1) B - W-B Engine switch Engine switch on (IG) 11 to 14 V A38-3 (+B) - C53-81 (E1) B - W-B Power source of ECM Engine switch on (IG) 11 to 14 V A38-2 (+B2) - C53-81 (E1) B - W-B Power source of ECM Engine switch on (IG) 11 to 14 V C53-58 (OC1+) - C53-57 (OC1-) B - B-L Camshaft oil control valve (OCV) (for Intake Side of Bank 1) Idling Pulse generation
(See waveform 1 in a)C53-52 (OC2+) - C53-51 (OC2-) L-B - R-B Camshaft oil control valve (OCV) (for Intake Side of Bank 2) Idling Pulse generation
(See waveform 1 in a)C53-56 (OE1+) - C53-55 (OE1-) L-W - L-B Camshaft oil control valve (OCV) (for Exhaust Side of Bank 1) Idling Pulse generation
(See waveform 1 in a)C53-50 (OE2+) - C53-49 (OE2-) L-R - L-B Camshaft oil control valve (OCV) (for Exhaust Side of Bank 2) Idling Pulse generation
(See waveform 1 in a)A38-34 (MREL) - C53-81 (E1) W-R - W-B EFI relay Engine switch on (IG) 11 to 14 V C53-74 (VG) - C53-75 (E2G) L-Y - G-W Mass air flow meter Idling, Shift lever in P or N, A/C switch off 0.5 to 3.0 V C53-73 (THA) - C53-97 (ETHW) Y-B - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V C53-76 (THW) - C53-98 (ETHA) G-B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V C53-80 (VCTA) - C53-79 (ETA) B-Y - B Power source of throttle position sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V C53-78 (VTA1) - C53-79 (ETA) B-L - B Throttle position sensor (for engine control) Engine switch on (IG),
Accelerator pedal fully released0.5 to 1.1 V Engine switch on (IG),
Accelerator pedal fully depressed3.2 to 4.8 V C53-77 (VTA2) - C53-79 (ETA) B-R - B Throttle position sensor (for sensor malfunction detection) Engine switch on (IG),
Accelerator pedal fully released2.1 to 3.1 V Engine switch on (IG),
Accelerator pedal fully depressed4.6 to 5.0 V A38-55 (VPA) - A38-58 (EPA) R - W-L Accelerator pedal position sensor (for engine control) Engine switch on (IG),
Accelerator pedal released0.5 to 1.1 V Engine switch on (IG),
Accelerator pedal fully depressed2.6 to 4.5 V A38-56 (VPA2) - A38-60 (EPA2) GR-G - BR Accelerator pedal position sensor (for sensor malfunctioning detection) Engine switch on (IG),
Accelerator pedal released1.2 to 2.0 V Engine switch on (IG),
Accelerator pedal fully depressed3.4 to 5.0 V A38-57 (VCPA) - A38-58 (EPA) L-W - W-L Power source of accelerator pedal position sensor (for VPA) Engine switch on (IG) 4.5 to 5.5 V A38-59 (VCP2) - A38-60 (EPA2) V - BR Power source of accelerator pedal position sensor (for VPA2) Engine switch on (IG) 4.5 to 5.5 V C53-22 (HA1A) - C53-23 (E04) L - W-B A/F sensor heater Idling with warm engine Pulse generation
(See waveform 2 in b)Engine switch on (IG) 11 to 14 V C53-20 (HA2A) - C53-21 (E05) G - W-B A/F sensor heater Idling with warm engine Pulse generation
(See waveform 2 in b)Engine switch on (IG) 11 to 14 V C53-126 (A1A+) - C53-81 (E1) G - W-B A/F sensor Engine switch on (IG) 3.3 V* C53-125 (A1A-) - C53-81 (E1) R - W-B A/F sensor Engine switch on (IG) 2.9 V* C53-103 (A2A+) - C53-81 (E1) P - W-B A/F sensor Engine switch on (IG) 3.3 V* C53-102 (A2A-) - C53-81 (E1) L - W-B A/F sensor Engine switch on (IG) 2.9 V* C53-45 (HT1B) - C53-46 (E03) G-B - W-B Heated oxygen sensor heater Idling Below 3.0 V Engine switch on (IG) 11 to 14 V C53-44 (HT2B) - C53-46 (E03) B - W-B Heated oxygen sensor heater Idling Below 3.0 V Engine switch on (IG) 11 to 14 V C53-114 (OX1B) - C53-115 (EX1B) G - L Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor Pulse generation
(See waveform 3 in c)C53-112 (OX2B) - C53-113 (EX2B) R - W Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor Pulse generation
(See waveform 3 in c)C53-86 (#10) - C53-43 (E01) R-L - W-B Fuel injector Engine switch on (IG) 11 to 14 V Idling Pulse generation
(See waveform 4 in d)C53-109 (#20) - C53-43 (E01) L - W-B Fuel injector Engine switch on (IG) 11 to 14 V Idling Pulse generation
(See waveform 4 in d)C53-85 (#30) - C53-43 (E01) R-B - W-B Fuel injector Engine switch on (IG) 11 to 14 V Idling Pulse generation
(See waveform 4 in d)C53-108 (#40) - C53-43 (E01) Y - W-B Fuel injector Engine switch on (IG) 11 to 14 V Idling Pulse generation
(See waveform 4 in d)C53-84 (#50) - C53-43 (E01) G - W-B Fuel injector Engine switch on (IG) 11 to 14 V Idling Pulse generation
(See waveform 4 in d)C53-107 (#60) - C53-43 (E01) R - W-B Fuel injector Engine switch on (IG) 11 to 14 V Idling Pulse generation
(See waveform 4 in d)C53-83 (#70) - C53-43 (E01) W - W-B Fuel injector Engine switch on (IG) 11 to 14 V Idling Pulse generation
(See waveform 4 in d)C53-106 (#80) - C53-43 (E01) R-B - W-B Fuel injector Engine switch on (IG) 11 to 14 V Idling Pulse generation
(See waveform 4 in d)C53-94 (KNK1) - C53-93 (EKNK) R - G Knock sensor Engine speed maintained at 4000 rpm after warming up engine Pulse generation
(See waveform 5 in e)C53-117 (KNK2) - C53-116 (EKN2) W - B Knock sensor Engine speed maintained at 4000 rpm after warming up engine Pulse generation
(See waveform 5 in e)C53-96 (KNK3) - C53-95 (EKN3) W - B Knock sensor Engine speed maintained at 4000 rpm after warming up engine Pulse generation
(See waveform 5 in e)C53-119 (KNK4) - C53-118 (EKN4) R - G Knock sensor Engine speed maintained at 4000 rpm after warming up engine Pulse generation
(See waveform 5 in e)C53-92 (VV1+) - C53-91 (VV1-) R - Y Variable valve timing (VVT) sensor (for Intake Side of Bank 1) Idling Pulse generation
(See waveform 6 in f)C53-87 (VV2+) - C53-88 (VV2-) R - Y Variable valve timing (VVT) sensor (for Intake Side for Bank 2) Idling Pulse generation
(See waveform 6 in f)C53-69 (EV1+) - C53-68 (EV1-) R-L - Y Variable valve timing (VVT) sensor (for Exhaust Side of Bank 1) Idling Pulse generation
(See waveform 17 in q)C53-64 (EV2+) - C53-65 (EV2-) R-L - Y Variable valve timing (VVT) sensor (for Exhaust Side of Bank 2) Idling Pulse generation
(See waveform 17 in q)C53-110 (NE+) - C53-111 (NE-) W - G-W Crankshaft position sensor Idling Pulse generation
(See waveform 6 in f)C53-40 (IGT1) - C53-81 (E1) B-Y - W-B Ignition coil (ignition signal) Idling Pulse generation
(See waveform 7 in g)C53-33 (IGT2) - C53-81 (E1) L-B - W-B Ignition coil (ignition signal) Idling Pulse generation
(See waveform 7 in g)C53-37 (IGT3) - C53-81 (E1) B - W-B Ignition coil (ignition signal) Idling Pulse generation
(See waveform 7 in g)C53-34 (IGT4) - C53-81 (E1) L-B - W-B Ignition coil (ignition signal) Idling Pulse generation
(See waveform 7 in g)C53-35 (IGT5) - C53-81 (E1) G-R - W-B Ignition coil (ignition signal) Idling Pulse generation
(See waveform 7 in g)C53-36 (IGT6) - C53-81 (E1) G - W-B Ignition coil (ignition signal) Idling Pulse generation
(See waveform 7 in g)C53-38 (IGT7) - C53-81 (E1) G-W - W-B Ignition coil (ignition signal) Idling Pulse generation
(See waveform 7 in g)C53-39 (IGT8) - C53-81 (E1) G-B - W-B Ignition coil (ignition signal) Idling Pulse generation
(See waveform 7 in g)C53-104 (IGF1) - C53-81 (E1) G-B - W-B Ignition coil (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.5 V Idling Pulse generation
(See waveform 7 in g)C53-105 (IGF2) - C53-81 (E1) R - W-B Ignition coil (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.5 V Idling Pulse generation
(See waveform 7 in g)C53-63 (PRG) - C53-81 (E1) L-B - W-B Purge VSV Engine switch on (IG) 11 to 14 V Idling Pulse generation
(See waveform 8 in h)A38-13 (SPD) - C53-81 (E1) V-R - W-B Speed signal from combination meter Driving at 20 km/h (12 mph) Pulse generation
(See waveform 9 in i)A38-46 (STA) - C53-81 (E1) R-B - W-B Starter signal Cranking 5.5 V or higher C53-120 (NSW) - C53-81 (E1) L - W-B Park/neutral position switch Engine switch on (IG), Shift lever in other than P and N 11 to 14 V Engine switch on (IG), Shift lever in P or N Below 3.0 V A38-36 (STP) - C53-81 (E1) R - W-B Stop light switch Brake pedal depressed 7.5 to 14 V Brake pedal released Below 1.5 V A38-35 (ST1-) - C53-81 (E1) R-W - W-B Stop light switch
(opposite to STP terminal)Engine switch on (IG),
Brake pedal depressedBelow 1.5 V Engine switch on (IG),
Brake pedal released7.5 to 14 V C53-19 (M+) - C53-82 (ME01) B-W - W-B Throttle actuator Idling with warm engine Pulse generation
(See waveform 10 in j)C53-18 (M-) - C53-82 (ME01) GR - W-B Throttle actuator Idling with warm engine Pulse generation
(See waveform 11 in k)A38-48 (FC) - C53-81 (E1) L-R - W-B Fuel pump control Engine switch on (IG) 11 to 14 V A38-52 (FPC) - C53-81 (E1) W - W-B Fuel pump control Engine switch on (IG) Below 1.5 V A38-24 (W) - C53-81 (E1) R-Y - W-B MIL Engine switch on (IG) Below 3.0 V Idling 11 to 14 V A38-16 (TC) - C53-81 (E1) V-W - W-B Terminal TC of DLC3 Engine switch on (IG) 11 to 14 V A38-15 (TACH) - C53-81 (E1) W-G - W-B Engine speed Idling Pulse generation
(See waveform 12 in l)A38-30 (VPMP) - C53-81 (E1) B-L - W-B Vent valve (built into canister pump module) Engine switch on (IG) 11 to 14 V A38-49 (MPMP) - C53-81 (E1) G-O - W-B Leak detection pump (built into canister pump module) Leak detection pump OFF Below 3.0 V Leak detection pump ON 11 to 14 V C53-67 (VCV1) - C53-97 (ETHW) L - BR Power source for sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V C53-66 (VCV2) - C53-97 (ETHW) L - BR Power source for sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V C53-121 (PPMP) - C53-97 (ETHW) P - BR Canister pressure sensor (built into canister pump module) Engine switch on (IG) 3.3 to 4.0 V C53-32 (ALT) - C53-81 (E1) R - W-B Generator Engine switch on (IG) 11 to 14 V A38-10 (CANH) - C53-81 (E1) P - W-B CAN communication line Engine switch on (IG) Pulse generation
(See waveform 13 in m)A38-11 (CANL) - C53-81 (E1) B - W-B CAN communication line Engine switch on (IG) Pulse generation
(See waveform 14 in n)C53-62 (ACIS) - C53-81 (E1) L-Y - W-B VSV for ACIS (Acoustic Control Induction System) operation signal Engine switch on (IG) 11 to 14 V C53-28 (AIRV) - C53-81 (E1) BR - W-B Air switching valve for secondary air injection system Engine switch on (IG) 11 to 14 V C53-54 (AIRP) - C53-81 (E1) P - W-B Air pump control Engine switch on (IG) 11 to 14 V C53-30 (AIDI) - C53-81 (E1) G - W-B Diagnostic information signal for air injection system Air injection system operates Pulse generation
(See waveform 16 in p)A38-54 (AIP) - C53-98 (ETHA) P-L - BR Secondary air injection system pressure signal Engine switch on (IG) 3.0 to 3.6 V A38-43 (ARV2) - C53-81 (E1) R-L - W-B Air switching valve for secondary air injection system Engine switch on (IG) 11 to 14 V C53-53 (ARP2) - C53-81 (E1) P-L - W-B Air pump control Engine switch on (IG) 11 to 14 V C53-29 (AID2) - C53-81 (E1) G-Y - W-B Diagnostic information signal for air injection system Air injection system operates Pulse generation
(See waveform 16 in p)A38-53 (AIP2) - C53-97 (ETHW) LG-B - BR Secondary air injection system pressure signal Engine switch on (IG) 3.0 to 3.6 V C53-90 (G2) - C53- 89 (G2-) G - Y Camshaft position sensor Idling Pulse generation
(See waveform 15 in o)A38-18 (DI) - C53-81 (E1) G-Y - W-B Fuel pump control Engine switch on (IG) 0 to 3.0 V A38-14 (STSW) - C53-81 (E1) R - W-B Starter switch Shift lever in P or N, Cranking 6.0 V or higher A38-41 (ACCR) - C53-81 (E1) L-Y - W-B ACC relay control signal Engine switch on (IG) → Cranking 11 to 14 V → Below 1 V C53-16 (STAR) - C53-81 (E1) L - W-B Starter relay control Engine switch on (IG) Below 1.5 V Cranking 5.5 V or higher C53-72 (PSP) - C53-81 (E1) G - W-B Power steering oil pressure sensor Engine switch on (IG) 0.5 to 4.5 V HINT:
*: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
- WAVEFORM 1:CAMSHAFT OIL CONTROL VALVE (OCV)
Terminal No. (Symbol) Tool Setting Condition C53-58 (OC1+) - C53-57 (OC1-) 5 V/DIV., 1 msec./DIV. Idling C53-52 (OC2+) - C53-51 (OC2-) 5 V/DIV., 1 msec./DIV. Idling C53-56 (OE1+) - C53-55 (OE1-) 5 V/DIV., 1 msec./DIV. Idling C53-50 (OE2+) - C53-49 (OE2-) 5 V/DIV., 1 msec./DIV. Idling - WAVEFORM 2:A/F SENSOR SIGNAL
Terminal No. (Symbol) Tool Setting Condition C53-22 (HA1A) - C53-23 (E04) 5 V/DIV., 10 msec./DIV. Idling with warm engine C53-20 (HA2A) - C53-21 (E05) 5 V/DIV., 10 msec./DIV. Idling with warm engine HINT:
The wavelength varies in accordance with the engine operating condition.
- WAVEFORM 3:HEATED OXYGEN SENSOR
Terminal No. (Symbol) Tool Setting Condition C53-114 (OX1B) - C53-115 (EX1B) 0.2 V/DIV., 200 msec./DIV. Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor C53-112 (OX2B) - C53-113 (EX2B) 0.2 V/DIV., 200 msec./DIV. Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor HINT:
In the Data List, item O2S B1S2 or O2S B2S2 shows the ECM input values from the heated oxygen sensor.
- WAVEFORM 4:INJECTOR NO. 1 (TO NO. 8) INJECTION SIGNAL
Terminal No. (Symbol) Tool Setting Condition C53-86 (#10) - C53-43 (E01) 20 V/DIV., 20 msec./DIV. Idling C53-109 (#20) - C53-43 (E01) 20 V/DIV., 20 msec./DIV. Idling C53-85 (#30) - C53-43 (E01) 20 V/DIV., 20 msec./DIV. Idling C53-108 (#40) - C53-43 (E01) 20 V/DIV., 20 msec./DIV. Idling C53-84 (#50) - C53-43 (E01) 20 V/DIV., 20 msec./DIV. Idling C53-107 (#60) - C53-43 (E01) 20 V/DIV., 20 msec./DIV. Idling C53-83 (#70) - C53-43 (E01) 20 V/DIV., 20 msec./DIV. Idling C53-106 (#80) - C53-43 (E01) 20 V/DIV., 20 msec./DIV. Idling HINT:
The wavelength becomes shorter as the engine speed increases.
- WAVEFORM 5:KNOCK SENSOR
Terminal No. (Symbol) Tool Setting Condition C53-94 (KNK1) - C53-93 (EKNK) 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 rpm after warming up engine C53-117 (KNK2) - C53-116 (EKN2) 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 rpm after warming up engine C53-96 (KNK3) - C53-95 (EKN3) 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 rpm after warming up engine C53-119 (KNK4) - C53-118 (EKN4) 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 rpm after warming up engine HINT:
- The wavelength becomes shorter as the engine speed increases.
- The waveforms and amplitudes displayed differ slightly depending on the vehicle.
- WAVEFORM 6:CRANKSHAFT POSITION SENSOR AND VVT SENSOR FOR INTAKE SIDE
Terminal No. (Symbol) Tool Setting Condition (a) C53-110 (NE+) - C53-111 (NE-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up (b) C53-92 (VV1+) - C53-91 (VV1-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up (c) C53-87 (VV2+) - C53-88 (VV2-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up HINT:
The wavelength becomes shorter as engine speed increases.
- WAVEFORM 7:IGNITER IGT SIGNAL (FROM ECM TO IGNITER) AND IGNITER IGF SIGNAL (FROM IGNITER TO ECM)
Terminal No. (Symbol) Tool Setting Condition (a) C53-40 (IGT1) - C53-81 (E1) 2 V/DIV., 20 msec./DIV. Idling (a) C53-33 (IGT2) - C53-81 (E1) 2 V/DIV., 20 msec./DIV. Idling (a) C53-37 (IGT3) - C53-81 (E1) 2 V/DIV., 20 msec./DIV. Idling (a) C53-34 (IGT4) - C53-81 (E1) 2 V/DIV., 20 msec./DIV. Idling (a) C53-35 (IGT5) - C53-81 (E1) 2 V/DIV., 20 msec./DIV. Idling (a) C53-36 (IGT6) - C53-81 (E1) 2 V/DIV., 20 msec./DIV. Idling (a) C53-38 (IGT7) - C53-81 (E1) 2 V/DIV., 20 msec./DIV. Idling (a) C53-39 (IGT8) - C53-81 (E1) 2 V/DIV., 20 msec./DIV. Idling (b) C53-104 (IGF1) - C53-81 (E1) 2 V/DIV., 20 msec./DIV. Idling (b) C53-105 (IGF2) - C53-81 (E1) 2 V/DIV., 20 msec./DIV. Idling HINT:
The wavelength becomes shorter as engine speed increases.
- WAVEFORM 8:PURGE VSV
Terminal No. (Symbol) Tool Setting Condition C53-63 (PRG) - C53-81 (E1) 10 V/DIV., 20 msec./DIV. Idling HINT:
If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.
- WAVEFORM 9:VEHICLE SPEED SIGNAL
Terminal No. (Symbol) Tool Setting Condition A38-13 (SPD) - C53-81 (E1) 2 V/DIV., 20 msec./DIV. Driving at 20 km/h (12 mph) HINT:
The wavelength becomes shorter as the vehicle speed increases.
- WAVEFORM 10:THROTTLE ACTUATOR POSITIVE TERMINAL
Terminal No. (Symbol) Tool Setting Condition C53-19 (M+) - C53-82 (ME01) 5 V/DIV., 1 msec./DIV. Idling with warm engine HINT:
The duty ratio varies depending on the throttle actuator operation.
- WAVEFORM 11:THROTTLE ACTUATOR NEGATIVE TERMINAL
Terminal No. (Symbol) Tool Setting Condition C53-18 (M-) - C53-82 (ME01) 5 V/DIV., 1 msec./DIV. Idling with warm engine HINT:
The duty ratio varies depending on the throttle actuator operation.
- WAVEFORM 12:ENGINE SPEED SIGNAL
Terminal No. (Symbol) Tool Setting Condition A38-15 (TACH) - C53-81 (E1) 5 V/DIV., 10 msec./DIV. Idling HINT:
The wavelength becomes shorter as the engine speed increases.
- WAVEFORM 13:CAN COMMUNICATION SIGNAL (REFERENCE)
Terminal No. (Symbol) Tool Setting Condition A38-10 (CANH) - C53-81 (E1) 1 V/DIV., 10 μsec./DIV. Engine stops and engine switch on (IG) HINT:
The waveform varies depending on the CAN communication signal.
- WAVEFORM 14:CAN COMMUNICATION SIGNAL (REFERENCE)
Terminal No. (Symbol) Tool Setting Condition A38-11 (CANL) - C53-81 (E1) 1 V/DIV., 10 μsec./DIV. Engine stops and engine switch on (IG) HINT:
The waveform varies depending on the CAN communication signal.
- WAVEFORM 15:CRANKSHAFT POSITION SENSOR AND CAMSHAFT POSITION SENSOR
Terminal No. (Symbol) Tool Setting Condition CH1: C53-110 (NE+) - C53-111 (NE-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up CH2: C53-90 (G2) - C53-89 (G2-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up HINT:
The wavelength becomes shorter as the engine speed increases.
- WAVEFORM 16:TERMINAL DI OF AIR INJECTION CONTROL DRIVER
Terminal No. (Symbol) Tool Setting Condition C53-30 (AIDI) - C53-81 (E1) 5 V/DIV., 20 to 40 msec./DIV. Performing system check using Techstream (Secondary Air Injection Check) C53-29 (AID2) - C53-81 (E1) 5 V/DIV., 20 to 40 msec./DIV. Performing system check using Techstream (Secondary Air Injection Check) HINT:
The wavelength changes when the air injection control driver detects malfunctions in the air injection system. Refer to DTC P0412: Secondary Air Injection System Switching Valve "A" Circuit; DTC P0415: Secondary Air Injection System Switching Valve "B" Circuit .
- WAVEFORM 17:CRANKSHAFT POSITION SENSOR AND VVT SENSOR FOR EXHAUST SIDE
Terminal No. (Symbol) Tool Setting Condition (a) C53-110 (NE+) - C53-111 (NE-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up (b) C53-69 (EV1+) - C53-68 (EV1-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up (c) C53-64 (EV2+) - C53-65 (EV2-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up HINT:
The wavelength becomes shorter as engine speed increases.
- WAVEFORM 1: