09 Toyota Tacoma will not start when it's cold out

Thank you I appreciate it a lot it makes complete sense I did replace the Ecu had the dealer program it it ran for two days sent it to the dealer cause I had enough they had the truck for a month could not figure it out charged me 700 to do nothing I'll send the old ecu to get rebuilt I'm just tired of putting money into it

 

Electrical gremlins are the worst. Did you buy the truck new?

 

You have that right No I bought it used in 2010

 

As I understand it, and I could be wrong, I believe the ECM. Switches ground to fire the injectors. If so, then the should be 12v present at each coil. If it is, start looking for a bad, loose ground on the motor and ecm.

 

Ok every one update on my truck I've been driving it had to heat the computer to start it pretty much every day yesterday I took a wire to the computer mount and grounded it and what do u know so far it's been starting I'll keep u guys updated if that was the fix

 

Ok guys it's raining out and what do u know no start again still waiting on my old ecm to comeback from being rebuilt and going to go over the wiring again but on another note does anyone have a wiring diagram for the head lights idk what the dealer did but I have no high beams

 

I'd find the fuse and relay and check them first. The relay is probably under the dash for the high beams. It's possible the stalk has gone bad, but unlikely.

 

Stole from here: not sure if this'll help


HOPE THIS HELPS SOME PEOPLE.....NOT RESPONSIBLE FOR MISTAKES

12 Voltswhite/blue (50A)+ignition harness

Second 12 Voltswhite/red (30A)+ignition harness

Startergreen/black+ignition harness

Second Starterblack/white+ignition harness

Ignitionblack/red+ignition harness

Second Ignitionblue/yellow+ignition harness
Third IgnitionN/A
Accessorywhite/green+ignition harness
Second AccessoryN/A
Third AccessoryN/A
Keysensegreen/black-ignition harnessUsing the status output from the remote start to trigger this wire will disarm the factory alarm without unlocking the doors.

Data Buslt. green/black (IMO), blue/white (IMI)dataECM, second plug from bottom, pins 15 and 16The ECM (Engine Control Module) is behind the glove box. The security light wire is purple/white (+) at the security light.
Can Bus Highyellow/blackdatadata link connector under driver dash, pin 6
Can Bus Lowblue/whitedatadata link connector under driver dash, pin 14
Can Bus Sw
Power Lock purple-driver kick, 10 pin plug, pin 4Meter this wire while turning the key in the driver door key cylinder.
Power Unlockgreen/black (double pulse)-driver kick, 10 pin plug, pin 8Meter this wire while turning the key in the driver door key cylinder. Can also use the passenger door key cylinder unlock wire, which only requires a single pulse. It is pink (-), in the passenger kick, 10 pin plug, pin 4
.Lock Motorblue/red5 wiredriver kick, 12 pin plug, pin 10
Driver Unlock Motorblue/black5 wiredriver kick, 10 pin plug, pin 9

Passenger Unlock Motorblue/black5 wirepassenger kick, 10 pin plug, pin 5
Parking Lights (-)green-headlight switch or BECU, pin 13The Body ECU is attached to the back of the fuse box. It has a single 26 pin plug.

Parking Lights (+)green+fuse box, 13 pin plug, pin 10

Hazardsred/white or white-switch or turn signal flasher, pin 10The turn signal flasher is behind the fuse box.
Turn Signal (Left)red/black (F), blue/black (R)+turn signal flasher, pins 4 and 5The turn signal flasher is behind the fuse box. On models without daytime running lights, the blue/black triggers the front and rear turn signals.
Turn Signal (Right)red/yellow (F), blue/yellow (R)+turn signal flasher, pins 2 and 3The turn signal flasher is behind the fuse box. On models without daytime running lights, the blue/yellow triggers the front and rear turn signals.

Headlightpink-headlight switch or BECU, pin 17The Body ECU is attached to the back of the fuse box. It has a single 26 pin plug.

AutoLights

Reverse Lightred/white+driver kick, gray 12 pin plug, pin 1

Left Front Door Triggergreen/white (ajar indicator)-instrument cluster or BECU, pin 4The Body ECU is attached to the back of the fuse box. It has a single 26 pin plug. The individual door trigger wires are at the fuse box. The LF door is green/yellow in an 18 pin plug, pin 7. The RF door is red/black in a 22 pin plug on the back, pin 8. The rear doors are pink/black in an 18 pin plug, pin 6. Use all three wires and diode isolate each.
Right Front Door Triggersee left front door trigger
Left Rear Door Triggersee left front door trigger
Right Rear Door Triggersee left front door trigger
Dome Supervisionblue-fuse box, black 13 pin plug, pin 9


Factory Alarm Armarms with lock
Factory Alarm Disarmdisarms with unlock
Disarm No Unlockuse key sense wire
Trunk Alarm ShuntN/A

Tachometerblack/whiteacdata link connector under driver dash, pin 9Also found at the ECM behind the glove box, second plug from the bottom, pin 1.

Speed Sensepurple/whiteacfuse box, black 13 pin plug, pin 5Also found at the ECM behind the glove box, second plug from the bottom, pin 8.

Brake Wireblue+fuse box, 11 pin plug, pin 2

Parking Brakegreen/yellow-fuse box, 18 pin plug, pin 5

Horn Triggergreen/red-fuse box, 18 pin plug, pin 10

Wipersblue/black (L), blue/red (H)+windshield wiper switch

Left Front Window (Up/Down)blue - blue/blackAdriver window switch in door
Right Front Window (Up/Down)blue/yellow - blackAdriver kick, 12 pin plug, pins 2 and 3
Left Rear Window (Up/Down)green/white - green/redAdriver kick, 12 pin plug, pins 7 and 1
Right Rear Window (Up/Down)green/black - greenAdriver kick, 12 pin plug, pins 5 and 6

Radio 12Vblue/yellow+radio harness
Radio Groundbrown-radio harness
Radio Ignitiongray+radio harness
Radio Illuminationgreen+radio harness
Factory Amp Turn-onN/A
Power AntennaN/A
Left Front Speaker (+/-)pink - purple+,-radio harness or amplifier If equipped, the amplifier is on the passenger side rear cabin wall.
Right Front Speaker (+/-)lt. green - blue+,-radio harness or amplifier
Left Rear Speaker (+/-)black - yellow+,-radio harness or amplifier
Right Rear Speaker (+/-)red - white+,-radio harness or amplifier