Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2001HIGHLANDER 2WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISDIAGRAMSELECTRICAL DIAGRAMSANTITHEFT AND ALARM SYSTEMSSERVICE HINTSENGINE IMMOBILIZER SYSTEM
2001 Toyota Highlander 2WD L4-2.4L (2AZ-FE)
Engine Immobilizer System
2001 Toyota Highlander 2WD L4-2.4L (2AZ-FE)SECTION Engine Immobilizer System
CIRCUIT OPENING RELAY
5 - 3 : Closed with the starter running
EFI RELAY
5 - 3 : Closed with the ignition SW at ON or ST position
E5 (A), E6 (B), E7 (C), E8 (D), E9 (E) ENGINE CONTROL MODULE
BATT - E1 : Always 9.0 - 14.0 volts
VC - E2 : 4.5 - 5.5 volts (Ignition SW at ON position)
VTA - E2 : 0.3 - 1.0 volts (Ignition SW on and throttle valve fully closed)
3.2 - 4.9 volts (Ignition SW on and throttle valve fully open)
VG - E2G : 1.1 - 1.5 volts (Engine idling and A/C SW off)
THA - E2 : 0.5 - 3.4 volts (Engine idling and intake air temperature 20°C, 66 °F)
THW - E2 : 0.2 - 1.0 volts (Engine idling and coolant temperature 60°C, 176 °F)
IGF - E1 : 4.5 - 5.5 volts (Ignition SW at ON position)
Pulse generation (Engine idling)
SIL - E1 : Pulse generation (During transmission)
TACH - E1 : Pulse generation (Engine idling)
STA - E1 : 6.0 volts or more (Engine cranking)
FC - EO1 : 9.0 - 14.0 volts (Ignition SW at ON position)
SPD - E1 : Pulse generation (Ignition SW on and rotate driving wheel slowly)
W - E01 : Below 3.0 volts (Ignition SW at ON position)
NSW - E1 : 9.0 - 14.0 volts (Ignition SW on and other shift position in P or N position)
0 - 3.0 volts (Ignition SW on and shift position in P or N position)
EVP1 - E01 : 9.0 - 14.0 volts (Ignition SW at ON position)
STP - E1 : 7.5 - 14.0 volts (Ignition SW on and brake pedal depressed)
Below 1.5 volts (Ignition SW on and brake pedal released)
KNK1 - E1 : Pulse generation (Engine idling)
PSW - E1 : 9.0 - 14.0 volts (Ignition SW at ON position)
HAF1A, HAF2A - E04 : Below 3.0 volts (Engine idling)
IGSW - E1 : 9.0 - 14.0 volts (Ignition SW at ON position)
MREL - E1 : 9.0 - 14.0 volts (Ignition SW at ON position)
G22+, NE(+) - NE(-) : Pulse generation (Engine idling)
OCV(+) - OCV(-) : Pulse generation (Ignition SW at ON position)
HT1 B, HT2B - E1 : 9.0 - 14.0 volts (Engine idling)
Below 3.0 volts (Ignition SW at ON position)
AF1A(+), AF2A(+) - E1 : 3.3 volts (Ignition SW at ON position)
AF1A(-), AF2A(-) - E1 : 3.0 volts (Ignition SW at ON position)
OX1B, OX2B - E1 : Pulse generation (Maintain engine speed at 2500 rpm for 90 sec. after warming up)
IGT1, IGT2, IGT3, IGT4 - E1 : Pulse generation (Engine idling)
#10, #20, #30, #40 - E01 : 9.0 - 14.0 volts (Ignition SW at ON position) Pulse generation (Engine idling)
5 - 3 : Closed with the starter running
EFI RELAY
5 - 3 : Closed with the ignition SW at ON or ST position
E5 (A), E6 (B), E7 (C), E8 (D), E9 (E) ENGINE CONTROL MODULE
BATT - E1 : Always 9.0 - 14.0 volts
VC - E2 : 4.5 - 5.5 volts (Ignition SW at ON position)
VTA - E2 : 0.3 - 1.0 volts (Ignition SW on and throttle valve fully closed)
3.2 - 4.9 volts (Ignition SW on and throttle valve fully open)
VG - E2G : 1.1 - 1.5 volts (Engine idling and A/C SW off)
THA - E2 : 0.5 - 3.4 volts (Engine idling and intake air temperature 20°C, 66 °F)
THW - E2 : 0.2 - 1.0 volts (Engine idling and coolant temperature 60°C, 176 °F)
IGF - E1 : 4.5 - 5.5 volts (Ignition SW at ON position)
Pulse generation (Engine idling)
SIL - E1 : Pulse generation (During transmission)
TACH - E1 : Pulse generation (Engine idling)
STA - E1 : 6.0 volts or more (Engine cranking)
FC - EO1 : 9.0 - 14.0 volts (Ignition SW at ON position)
SPD - E1 : Pulse generation (Ignition SW on and rotate driving wheel slowly)
W - E01 : Below 3.0 volts (Ignition SW at ON position)
NSW - E1 : 9.0 - 14.0 volts (Ignition SW on and other shift position in P or N position)
0 - 3.0 volts (Ignition SW on and shift position in P or N position)
EVP1 - E01 : 9.0 - 14.0 volts (Ignition SW at ON position)
STP - E1 : 7.5 - 14.0 volts (Ignition SW on and brake pedal depressed)
Below 1.5 volts (Ignition SW on and brake pedal released)
KNK1 - E1 : Pulse generation (Engine idling)
PSW - E1 : 9.0 - 14.0 volts (Ignition SW at ON position)
HAF1A, HAF2A - E04 : Below 3.0 volts (Engine idling)
IGSW - E1 : 9.0 - 14.0 volts (Ignition SW at ON position)
MREL - E1 : 9.0 - 14.0 volts (Ignition SW at ON position)
G22+, NE(+) - NE(-) : Pulse generation (Engine idling)
OCV(+) - OCV(-) : Pulse generation (Ignition SW at ON position)
HT1 B, HT2B - E1 : 9.0 - 14.0 volts (Engine idling)
Below 3.0 volts (Ignition SW at ON position)
AF1A(+), AF2A(+) - E1 : 3.3 volts (Ignition SW at ON position)
AF1A(-), AF2A(-) - E1 : 3.0 volts (Ignition SW at ON position)
OX1B, OX2B - E1 : Pulse generation (Maintain engine speed at 2500 rpm for 90 sec. after warming up)
IGT1, IGT2, IGT3, IGT4 - E1 : Pulse generation (Engine idling)
#10, #20, #30, #40 - E01 : 9.0 - 14.0 volts (Ignition SW at ON position) Pulse generation (Engine idling)
RENDER: 1.0x
NO RELATED
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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.