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1994 4runner IH1 & IH2 Wires

Old 03-08-2011, 07:08 AM
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1994 4runner IH1 & IH2 Wires

This is something I came up with this morning for mapping my IH1 and IH2 plugs from my 4Runner. This shows their pin number, wire color, and their corresponding to and from function.

I will be adding the 2001 Tundra pinout as I go along if anyone else is doing the same model and year swap.

Donor is 2001 tundra with AUTO harness
Recipient is 1994 4Runner M/T


I am no expert by any means, this is rough and im not 100% sure these are correct.

IH1
Pin 1: W-B, INDICATOR SW(FOR TRANSFER, M/T)
Pin 1: W-B, from Ground to indicator SW(for transfer, A/T)
Pin 3: V, From Combination meter to ECU W
Pin 5: G-W, From 15a STOP fuse TO Stop light switch to STP
Pin 6: L(blue), from CIRCUIT OPENING RELAY to DATA LINK CONNECTOR 1(CHECK CONNECTOR)
PIN 7: L(blue)-B, from A/C amplifier to IG1 to ECU ACT
Pin 8:B-R, From ABS ECU to DATA LINK CONNECTOR 1(CHECK CONNECTOR) TS
Pin 9: Y-B, From ABS ECU To DATA LINK CONNECTOR 1(CHECK CONNECTOR) TC
Pin 10: B-G, from 15A EFI fuse TO BATT
Pin 14: B-R, From Ignition switch 2
Pin 16/15: W-R, From TO A/C IDLEľUP VSV to +B1 & +B on ECU
Pin 20: G-L, from combo meter to ECU SPD
Pin 22: B-w, From Starter Relay to Cold start injector/start injector time sw
Pin 23: G-Y, from circuit opening relay to VOLUME AIR FLOW(AIR FLOW METER)

IH2

Pin 2: G-W, from ADD CONTROL RELAY to ECU 4WD
Pin 5: L(blue), From EFI main to IG1 to A/c Idle-Up VSV
Pin 6: B-R, From A/c Amp to IG1 to ECU ACV
Pin 7: R-W, from ground to BACKľUP LIGHT SW
Pin 8: B-O(orange), From Integration Relay to PARK/NEUTRAL POSITION SW(NEUTRAL START SW)
PIN 9: R-G, from ECU to Cruise control
Pin 10: G-Y, From 4WD INDICATOR[COMB. METER] to ADD DETECTION SW
Pin 11: Y-L(blue), From Oil Pressure sw to oil pressure gauge
Pin 13: G-L(blue), from illumination to Speed sensor
Pin 14: Y-G, From temp to WATER TEMP. SENDER
Pin 15: B-W, From A/C amplifier to IG1 To ECU A/C
Pin 18: G-O, from Combination meter to ECU PWR
Pin 19: G-R, from speed to speed sensor
Pin 20: B, from A/C amp to IG1 to combo meter
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Old 03-08-2011, 08:00 AM
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buttt I think i downloaded the wrong ECW for the 3.4l my wires aren't matching the pinout in the ECW i downloaded...
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Old 03-08-2011, 04:18 PM
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You may have, but keep in mind there were times when Toyota did mid-year changes on some of the computers. I know there are guys out there with wiring diagrams that don't match their pinouts.
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Old 03-08-2011, 08:20 PM
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ehhh, good to know. That may be the case. I have figured out most of the plugs for IE1

Pin 1: B-R, From Terminal 6 of Ignition 2 SW to Igniter
Pin 2: B-Y, from IG1 to Speed sensor
Pin 3: B-R, Terminal 6 of Ignition SW TO injectors
Pin 4: L(blue)-B, From IG1 switch to Neutral possition switch
Pin 5: B, From Ignitor TO COMBINATION METER
Pin 6:
Pin 7: W-B, From ECM to Transfer Neutral Position switch To ground
Pin 8: Y-B, From Oil pressure switch to OIL pressure gauge
Pin 10: Y-R, From Water Temp sender to Water temp gauge
Pin 13: W-L(blue), From ECM B+ Terminal 3 of EFI Relay to MAF sensor To ECM
Pin 14: BR(brown), From ECM to Oxygen sensor 2 to Ground
Pin 15: BR(brown), From DATA LINK CONNECTOR 3 To ground
Pin 18:
Pin 19: G-B, From Vapor Pressure System to ECM VC
Pin 20: W-G, From DATA LINK CONNECTOR 3 To ECM TC
Pin 26: G-W, From Vapor Pressure Ststem to ECm E2
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Old 01-12-2019, 11:44 AM
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94 runner vss

Hello, I'm new to forums and was just wondering if you now if a early 95(obd1) speedo vss will give a 98 auto trans ecm runner correct signal for shifting, just did a swap and am using the original 340H with the 98 runner ecm, been looking all over forum and having trouble coming up with a solution other than buying a $200 t100 ecm....runs great just wont shift from 1st
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