2008 toyota highlander

Asked by Jan 14, 2017 at 02:22 PM about the 2008 Toyota Highlander

Question type: General

Code p0354;p2237;p0354

1 Answer

73,875

P0354 TOYOTA - Ignition Coil 4 Primary/Secondary Circuit... Possible causes Faulty Ignition Coil 4 Ignition Coil 4 harness is open or shorted Ignition Coil 4 circuit poor electrical connection Faulty Engine Control Module (ECM)... Each ignition circuit is continuously monitored by the Engine Control Module (ECM). The test fails when the ECM does not receive a valid pulse signal from the ignition coil. Possible symptoms Engine Light ON (or Service Engine Soon Warning Light) Lack/Loss of Power Engine may be harder to start Engine hesitation Rough engine idle P0354 Toyota Description The ignition system on the vehicle uses individual ignition coils for each cylinder. The Engine Control Module (ECM) controls each ignition coil operation. The ECM sends a ON/OFF signal to energize the ignition coil to create a spark at the spark plug when a spark is required at the cylinder...........P2237 TOYOTA - A/F Sensor Bank 1 Open Circuit... Possible causes Faulty EFI Relay Faulty Air/Fuel Sensor Bank 1 Air/Fuel Sensor Bank 1 harness is open or shorted Air/Fuel Sensor Bank 1 circuit poor electrical connection Faulty Engine Control Module (ECM)... Possible symptoms Engine Light ON (or Service Engine Soon Warning Light) P2237 Toyota Description The Air-Fuel ratio (A/F) sensor provides output voltage approximately equal to the existing air-fuel ratio. The A/F sensor output voltage is used to provide feedback for the Engine Control Module (ECM) to control the air-fuel ratio. With the A/F sensor output, the ECM can determine deviation from the stoichiometric air-fuel ratio and control proper injection time. If the A/F sensor is malfunctioning, the ECM is unable to accurately control air-fuel ratio. The A/F sensor is equipped with a heater which heats the zirconia element. The heater is also controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is low), current flows to the heater which heats the sensor to facilitate detection of accurate oxygen concentration. The A/F sensor is a planar type. Compared to a conventional type, the sensor and heater portions are narrower. Because the heat of the heater is conducted through the alumina to zirconia (of the sensor portion), sensor activation is accelerated. The code is output when there is an open or short in the A/F sensor circuit, or if A/F sensor output drops. To detect these problems, the voltage of the A/F sensor is monitored when turning the ignition switch to the ON position, and the admittance (admittance is an electrical term that indicates the ease of flow of current) is checked while driving. If the voltage of the A/F sensor is between 0.6 V and 4.5 V, it is considered normal. If the voltage is outside of the specified range, or the admittance is less than the standard value, the ECM will determine that there is a malfunction in the A/F sensor. If the same malfunction is detected in the next driving cycle, the MIL is illuminated and a DTC is set.

1 of 1 people found this helpful.

Your Answer

Toyota Highlander Experts

  • #1
    Wendy Tucker
    Reputation
    4,450
  • #2
    Tom Demyan
    Reputation
    3,990
  • #3
    Shawntele Lewis
    Reputation
    2,450
View All

Related Models For Sale

Used Honda Pilot
471 Great Deals out of 30,514 listings starting at $1,399
Used Toyota 4Runner
291 Great Deals out of 21,643 listings starting at $1,750
Used Toyota RAV4
780 Great Deals out of 49,471 listings starting at $1,500
Used Acura MDX
416 Great Deals out of 17,904 listings starting at $1,995
Used Toyota Highlander Hybrid
20 Great Deals out of 1,741 listings starting at $3,900
Used Toyota Camry
1,037 Great Deals out of 72,820 listings starting at $295
Used Honda CR-V
800 Great Deals out of 53,789 listings starting at $1,750
Used Toyota Sienna
296 Great Deals out of 26,492 listings starting at $1,985
Used Ford Explorer
835 Great Deals out of 63,391 listings starting at $1,000
Used Nissan Pathfinder
319 Great Deals out of 24,408 listings starting at $1,250
Used Lexus RX 350
425 Great Deals out of 19,400 listings starting at $5,990
Used GMC Acadia
832 Great Deals out of 48,068 listings starting at $1,999
Used Toyota Sequoia
124 Great Deals out of 5,338 listings starting at $2,499
Used Jeep Grand Cherokee
891 Great Deals out of 70,437 listings starting at $950
Used Chevrolet Tahoe
677 Great Deals out of 39,487 listings starting at $1,000

Used Cars For Sale

2017 Toyota Highlander For Sale
10 Great Deals out of 16,275 listings starting at $25,820
2016 Toyota Highlander For Sale
40 Great Deals out of 1,303 listings starting at $22,175
2015 Toyota Highlander For Sale
102 Great Deals out of 2,696 listings starting at $18,960
2014 Toyota Highlander For Sale
57 Great Deals out of 1,141 listings starting at $18,988
2013 Toyota Highlander For Sale
55 Great Deals out of 1,053 listings starting at $14,399

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.